I'm working on a small story, and in it I'm wanting to include a city surrounded by multiple layers of walls. The walls themselves are colossal, but were created/held up by sorcery. I would go into more detail, but this question was about the city itself and not the walls.
I'm looking at a size of roughly 2,000 square miles in total and a population density of 5,000 people per square miles with a late medieval/early renaissance level of technology (15th/16th century). Is this even possbible? Sorcery can't just summon resources in this setting, so that option isn't present. Humans make up most of the population, but the small other groups use roughly the same amount of resources.
Theres also a magic system, of which I'll describe here.
-Magic is a natural force, while sorcery is interacting with that force.
-In order to cast any kind of spell, one must have the 'fuel' (the death of a sentient living thing), a mage to 'guide' the magic (or you get wild magic) and a target. Spells can take several days to do anything. Sorcery doesn't have a set range, but the further away the target it the better the chance of things going wrong.
-Sorcery isn't something someone is born with. It's a skill, just like being a blacksmith.
-Sorcery cannot create new matter, nor can it destroy matter. You can turn lead into gold, but you can't create coins from the air.
-Wild magic is 'charged' magic without any target. It usually manifests as natural disasters, horrific disease, or simply a giant ball of invisible force that levels entire cities.