Worldbuilding fun

[rmthorn]

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There's plenty of water, really, it's just that there's so very few places close enough to it to grow crops on. Limited supplies of land to use is a problem that's been around since forever, and given the number of isolated populations there's probably one nation or another using any version you can think of.
Unfortunately, I'm fried at the moment, so figuring out what those are, exactly, would feel entirely too much like work.

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You might be interested in Jared Diamond's "Collapse" (non-fiction), which discusses environmental degration and population pressure on several historical human societies. It might give you some ideas, at least if you're interested in how not to do things. :-)