You guys see Zee's post? The cat understands the evils of the water, because he is a wise lord. This is why Sarhush had to drain it.

The aftermath isn't depicted IC because Sarhush and Khthon are underground and don't go up to investigate what happens, but I'm imagining that the world goes from being covered by 80% water to something like 20%. What's left is continuous land that has big lakes and inland seas rather than an endless ocean with occasional islands.

Perhaps Yzechr's curse no longer affects all water and is confined to one of the remaining seas (and perhaps concentrated and made permanent, if it can't wander about the whole ocean anymore). Just an idea; I'll leave that to Vec and Cmm to establish if they want to go with it.

I'll probably draw a map of the world soon if nobody else wants to. It'd be useful for placement of mortal civilizations.