My world is made of a super-continent with very little isles, it has 100 countries, 97 of which are on land. 3 of those are underwater for folk who are able to live confortably in the depths of the sea. Most of those countries are on the east side of the continent. The center of the continent is too dangerous and harsh to be populated, but still it's not an arid place and has some nomadic tribes that manage to survive far away from society. The entire world speaks similar languages, how similar? Like how all germanic languages are similar or all slavic languages sound the same and some are interchangeable.


For a merchant living on a super continent would it still make sense to use ships as the primary way of transporting merch?

enter image description here

Also this is the actual size of the continent compared to the entire world map, this is a flat map, not a spherical one.

enter image description here

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    $\begingroup$ The emperors of China who built the Grand Canal certainly thought water travel was a great idea. So did the European canal builders of the 1600s and 1700s. $\endgroup$
    – user535733
    Commented Jan 3, 2022 at 18:21
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    $\begingroup$ Major navigable rivers are effectively highways that put an easy trade route to the middle of the continent, so they would have a big impact and are missing on your current map. $\endgroup$
    – Peteris
    Commented Jan 4, 2022 at 2:06
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    $\begingroup$ Don't neglect river, lake and canal trade routes. $\endgroup$
    – Monty Wild
    Commented Jan 4, 2022 at 6:27
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    $\begingroup$ Unrelated to the question, but if you're inventing names for places (or people) then google them first to make sure you're not treading on any existing toes. Iberia is an actual place - it's the chunk of Europe with Spain and Portugal. $\endgroup$
    – Graham
    Commented Jan 4, 2022 at 11:55
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    $\begingroup$ Ancient Mediterranean cultures effectively lived on a supercontinent; they weren't aware of the Americas or Australia. Local geography is more important than global geography. $\endgroup$
    – chepner
    Commented Jan 5, 2022 at 13:32

11 Answers 11


I believe that you may be asking slightly the wrong question. You ask:
"Will Ships still be useful on a super-continent"

To which my answer is .... Yes!

But a slightly better question is:
"Where will trade occur, and through what means"

Curiously, predicting trade is often a fairly good proxy for technical prowess and societal development (ie trade centers are often among the first places to adopt systems of currency, economics and written languages).

So, the societal hotspots for your continent may be: enter image description here

The area around Solnia is crammed with countries and easy land routes, quickly supplemented by sea trade. The sea is sheltered by the spit of Uruslania, and so sea travel is practical and easy in this region. As soon as rudimentary boats have been created, Velsia will be able to trade "across the sea" with dozens of countries. (I can imagine Velsa and Riveso as the capital of the world in the early days of sea travel - similar to what Rome was. Heck, put a shoe-shape on the end of the Riveso Peninsula and it Velsa and Riveso are practically Italy and Greece)

Similar stories play out in the other circled regions, though probably to a lesser extend. Crinteto region I imagine as a bit of a late-comer to the party, as it is more exposed. Ship designs from that region have smaller cargo payloads, but their shipbuilding is highly advanced. Their captains known for sea-faring skill. But they don't have a great economy.

These hotspots will generate internal trade via short sea routes, but until shipping advances allow longer distance travel, they won't really interact other than via long-distance-road transport - silk road style. I don't know exactly what tech level required is. 17th century ships totally could, but even in the 2nd century, India was trading with China via the sea. Anyway, after ships reach some level of seaworthyness able to cross long distances (perhaps the designs are originally Crinteto?), sea trade really takes off, and the land routes change.

In particular, notice how narrow it is between Torsand and Freinsia? That's a prime land transport route. Goods may be transported in from the south, hit a port at Freinsia, be transported by land to Torsand, and from their access dozens of other countries. Iragoa or Numidia may frequently fight for trade deals, or may become neutral (like Switzerland, which historically had a lot of trade passing through).

Mariteto and Cirta are also a candidate for a great overland route, but there aren't many socieities over on the west. But imagine if Verisianio wanted to trade with Parasinia. Either they have to go anticlockwise and possibly use the overland route at Freinsia, or they go anticlockwise and they cut a long way off the journey by overlanding through Mariteto. However, Mariteto does have something else going for it: It'd be a great canal building project. I can imagine distant wealthy societies paying for the cutting of a canal through places like Mariteto and Cirintia. Virdria may be a bit remote to be economically feasible to drive a canal through.

Here's a rough trade map showing some of the prime trade routes that I can forsee arising. Of course I don't know what the mountains are like, or if one country is mostly swamp, but it may give you some ideas where to look for interesting stories.

enter image description here

Some things to note:

  • Ships could stop off anywhere along the coast, not only at the points I've indicated. The points I've indicated them stopping off at are what I consider likely travel hubs.
  • The Dorn empire may make for easy land trading as fewer political boundaries occur. Similar reasons are for the routing of land routes through as few-er countries as possible.

Oh, and vikings are totally found in Iberia and raid across to Parasina.

A couple interesting things from comments:

  • @FuzzyChef points out the interior of supercontinents are often deserts - which are inhospitable and hard to travel across. This will help drive trade via sea, and may also explain why the west doesn't have many empires.
  • @clockw0rk mentions that the underwater cities will also drive more sea trade - both because they provide trade destinations and because they may be able to with assist technology and personal. I do however think that most transport would be open sea rather than through underwater caves - though underwater caves would definitely be the cool solution.
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    $\begingroup$ Your analysis seems pretty good, with graphics too. Your analysis may be even better if the OP included certain topography details, such as rivers, mountains desert, estuaries/harbors and any islands that would provide protection and obstacles. I would like to know what the huge, unclaimed area is on the west coast. A massive jungle or desert? $\endgroup$
    – Sonvar
    Commented Jan 3, 2022 at 20:33
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    $\begingroup$ @sdfgeoff people usually pay for that kind of work you just did for free, I'm incredibly thankful, also the tone of the answer was very easy to read and entertaining, that post is worth way more upvotes. $\endgroup$
    – Drien RPG
    Commented Jan 3, 2022 at 20:38
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    $\begingroup$ @Sonvar I tried watching some documentaries and reading some stuff on how mountains/rivers/mineral deposits/vulcanoes/riffs and other stuff works, but it's still a lot of information to handle and it doesn't serve me any purpose for my project at this moment, maybe in the future I will take some hours and start writing and drawing. For the moment my projects are to build as many games focused around my world as possible, but for now I will think about some turn based text games, one adventure game and a 3D fighting game with some rpg stuff in it. $\endgroup$
    – Drien RPG
    Commented Jan 3, 2022 at 20:40
  • $\begingroup$ @RPGlife it will have purpose to determine overland routes and may impact socio-economic dynamics that make certain routes safer than others. example, if Numidia was in a mountainous region, straddling the only north-south pass, raided trade there, it may cause that pass being unusable. $\endgroup$
    – Sonvar
    Commented Jan 3, 2022 at 20:45
  • $\begingroup$ Nice answere, I want to further exapand it a little: Are there "swimming cities" in the ocean? Since it is the only land mass on the entire world, i could imagine pirates and vagabounds settling directly on the sea, only visiting land like every 5 years or so to clean the ship. Also the folks living underwater could probably take part in trading routes, possibly transportating stuff under the continent through flooded caves and whatnot. Also, since this is fantasy: there COULD be an airport for zeppelin and merchants riding on flying animals over the continent. $\endgroup$
    – user59660
    Commented Jan 4, 2022 at 15:06

There is preindustrial transport rule of thumb:

  • cart transport is ~5 times less expensive (per ton*km) than pack animals

  • river transport is ~5 times less expensive than cart transport

  • ocean transport is ~5 times less expensive than river transport

So it was more expensive to move goods on pack animals ~100 km from port to farm than to move them from England to North American colonies.

It is very approximate rule - sailing 100 km in Ionic sea and in Roaring 40s is not the same, you may have a nest of pirates in the way, land transport may be safer even if more expensive, etc.

So if there is no river then ocean then ship is ~25 times more efficient than cart, and if there is no good road (you have to go over mountains, for example) - then its ~125.

Even neighboring countries may prefer to trade most of their goods via ocean rather than land, even if you have to go 10x bigger distance on ship.

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    $\begingroup$ Is there a source for this rule of thumb? I'd like to learn more about it. $\endgroup$
    – Tom
    Commented Jan 5, 2022 at 7:42
  • $\begingroup$ @Tom Checked my notes - there is some Russian quote about 5s rule (not 7) with unknown source. It looks like you can take some estimation at ORBIS system with similar results and take a look Edict of Diocletian (but Roman carts were less efficient and use of lateen sail has just began). $\endgroup$
    – Vashu
    Commented Jan 5, 2022 at 12:07
  • $\begingroup$ Nice! I wonder if there is something similar in the modern world. I imagine it's similar, with trucks > planes > trains > ships. Although now I've written it, journey duration is also a significant factor these days. $\endgroup$
    – sdfgeoff
    Commented Jan 5, 2022 at 17:41
  • $\begingroup$ @Tom Also in "The Sea and Civilization: by Lincoln Paine there is number about wool transport being 14x times cheaper over sea than on cart - that would give coefficient about 3.8 $\endgroup$
    – Vashu
    Commented Jan 5, 2022 at 19:33

There cannot be a single answer, it depends on the location of the departure and arrival places.

It's all a trade off between the cost of the two alternatives:

  1. going from A to B directly on land
  2. going from A to the closest port, then travel by sea to the closest port to B, then go to B.

Within the cost you should include:

  • how long does it take to go from A to B
  • how likely is the trip to succeed (an option that costs 1 but has a 0.01 success rate is less convenient than an option that costs 10 with a 0.5 success rate)

For a reference, this map shows how long did it take to go from Rome to other places in the Empire

enter image description here

Notice what a big difference does it make the presence of the sea

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    $\begingroup$ From what I have heard in other places, the cost of shipping something over land is about 25 times the cost of shipping it on water. Shipping will be big. $\endgroup$
    – EvilSnack
    Commented Jan 4, 2022 at 3:43
  • $\begingroup$ Don't forget "From A to B by land requires crossing countries D, E and F" and if you're on less than friendly relations with any of those, going by C is your better option. $\endgroup$ Commented Jan 4, 2022 at 7:50
  • $\begingroup$ @EvilSnack clearly not in North America, which do freight rail very, very efficiently. $\endgroup$ Commented Jan 4, 2022 at 16:53
  • $\begingroup$ @Harper Are you talking about transporting something from a point in North America to another point in North America where their is no water between them? $\endgroup$
    – Catprog
    Commented Jan 5, 2022 at 10:05
  • $\begingroup$ @Catprog yeah, like the iron mines around Duluth to the mills at Gary Indiana, or Albany-Cleveland/Toledo/Chicago, or Chicago-Houston. Rail are major players in those corridors. $\endgroup$ Commented Jan 5, 2022 at 20:37

It depends on where the rivers and mountain ranges are, and on whether there are any rival states that make trade difficult in certain regions.


Consider this completely fictional planet with a super-continent:

enter image description here

Remember that Europe+Asia+Africa is the equivalent of a super-continent, and for a long time, nearly all trade was within that super-continent (and to a large extent, within small parts of that super-continent).

Even nowadays, a vast majority of long-distance trade is still sent by ship around/through that super-continent. The disruption following the blockage of the Suez Canal last year made that abundantly clear.

Even internally, a lot of trade was done using ships (over rivers and canals) in large parts of Europe and elsewhere for a long time. The move to trains and then lorries is quite recent.

The consequence is that many of the largest cities in the world are either sea ports or on large rivers (or both, on estuaries of large rivers):

  • Tokyo: sea port
  • Shanghai: on a river / sea port
  • New York: sea port
  • Istanbul: sea port
  • Los Angeles: sea port
  • Paris: on a river
  • London: on a river / sea port
  • Hong Kong: sea port
  • Amsterdam: sea port etc.

Though of course they current size is recent, they gained prominent status because of their situation quite a long time ago.


Yes, definitely, just like it happened in real life.

Traveling between the opposite sides of your supercontinent would be much easier by sailing around, than going over land. My proof is that in real life, much bigger detours were made to avoid land journeys.

In the USA, the biggest cities were on the two coasts, and people traveled between them mostly by ship. Before the Panama Canal was completed in 1914, the journey was very long, but still preferable to the land route. Even in the late 19th century, when there was a rail connection between the two coasts, travel (and especially bulk cargo transport) by ship was still used.

If this real world detour was historically preferable to the land route, then surely on your continent the (significantly less than real Earth) detour will be preferred over land routes.

image from Wikipedia

(I know that they often used the Magellan straits, this drawing is only an illustration for the distances involved. And yes, passengers often debarked in Panama, crossed over land, and boarded another ship, but even that is a big detour, and not really practical for cargo, making the long detour common until the completion of the canal)


From what you've described about the world, it seems like the large Western/central region is difficult to pass through on land. Those in the Southern countries would want to sail to the Northwestern countries instead, for example. Another thing to consider is with so many countries on the East coast, passing through each civilization might be a logistical hassle (border patrols, tolls, political conflict). It might be easier to simply sail around them than travel through so many.


If they wanted to get from one coast to another, then sure. Especially if there were barriers like mountains on the land routes. Then again, such a large ocean might be an extremely windy and stormy ocean, which could make sailing tough. Although maybe the windiness could help too..


Canals... depending on geography

Consider the Guineas in South America (French Guinea, Guyana, Suriname). Almost all the development is coastal. The countries lay claim to vast inland areas, but it is deep jungle with precious little development or human settlement: mostly it belongs to the animal kingdom.

Your eastern peninsula has many countries, but almost all are coastal. So they might work like the Guineas, with all the development coastal and the inland borders being mostly notional, as the territories are difficult to inhabit or control.

However, that doesn't work for the main continent. There are many countries entirely landlocked. So either a) they don't trade much and are largely self-contained (like the Plains Indians)... or b) they rely on navigable rivers or man-made canals, like most of Europe.

Canals were being built 2500 years ago by the Chinese. It can be done by any nation with water and sufficient organization; it's certainly easier than building the Pyramids, and with much better economic payoff.

You said "pre-mechanical-engine" -- that is important. If you can build and engine, you can build rails and locomotives, and that's the end of canals for any but the lowest value bulk commodities.

So depending on your geography, era and national determination, you may be talking about the "age of the canals".

You would have to figure out whether the "lock" gets invented (1000 years ago on Earth), as that will greatly increase the reach of canals, making it unnecessary for all canals to be dug to the depth of nearby rivers.

(The only way a waterway can be navigable and at a slope is for the slope to be very slight and for the flow to be enormous - pretty much diverting a large river. Water supply is a frequent problem for canals; some even had elaborate pumping stations.)


Note that there is something called a tow barge. This is basically a ship being pulled by a horse who's walking next to it on land. These were the superhighways of the past and are most effective inland, not across seas, so these are perfect for a supercontinent.

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    $\begingroup$ Tow barges work great with purpose-built canals including locks, but that is relatively high technology. On rivers they work great only between areas of waterfalls, rapids, etc. $\endgroup$ Commented Jan 4, 2022 at 14:32
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    $\begingroup$ However, "pre-motor" is exactly when the canals did the best. Pretty much the minute motors were a thing, railroads curb-stomped canals $\endgroup$ Commented Jan 4, 2022 at 17:02

If your supercontinent have large and very long rivers like those The Mississipi river and those rivers on the Amazonia then it makes sense to use ships for transportations of goods and people but they would needed to be found throughout the entire supercontinent. In this way most cities in your supercontinent would have a port for goods and people to arrive and leave.


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