Starting with the Earth as we know as a template, you would notice two things:
The ebb and flow of the sea and rivers (specially regarding tidal bores such as Pororoca) has an eroding effect on the landscape. 100m is an expletive lot. It will go over island and flatten them out in geological time. Beaches will also be much wider.
The same forces that cause tides also stretch the planet. Expect much more tectonism.
Earth tide (also known as solid Earth tide, crustal tide, body tide, bodily tide or land tide) is the displacement of the solid earth's surface caused by the gravity of the Moon and Sun. Its main component has meter-level amplitude at periods of about 12 hours and longer. The largest body tide constituents are semi-diurnal, but there are also significant diurnal, semi-annual, and fortnightly contributions. Though the gravitational forcing causing earth tides and ocean tides is the same, the responses are quite different.
For comparison, the highest tide on Earth is 12 meters high. I don't know how the Earth tide would scale, but if we assume it does so linearly, it would mean a 9m Earth tide - you might see a noticeable bulge going up and down everyday around the equator!
Other than that, 200 Earth days rotation makes for a very hot place. Venus is kinda like that. If your planet is in the goldilocks zone, it will need a permanent cloud cover on the sunny side in order to get a chance to have Earth like temperatures and maintain water. It might be possible:
It has until recently been assumed that the rotation rate or day-night cycle of Venus would have to be increased for successful terraformation to be achieved. More recent research has, however, shown that the current slow rotation rate of Venus is not at all detrimental to the planet's capability to support an Earth-like climate. Rather, the slow rotation rate would, given an Earth-like atmosphere, enable the formation of thick cloud layers on the side of the planet facing the sun. This in turn would raise planetary albedo and act to cool the global temperature to Earth-like levels, despite the greater proximity to the Sun. According to calculations, maximum temperatures would be just around 35° C (95° F), given an Earth-like atmosphere.
Otherwise the only way to keep water is through a very unreal level of atmospheric pressure.