You can use mountains instead of valleys, it usually means you get less water and building space, but the map is almost the same.
[Edited by sauced, 2/22/2014 1:18:09 AM]
Currently playing these
While there are lots of mods ranging from adding in extra goods, crops, buidlings and jobs, to mods that tweak everything from resource storage capacities to production quantity, none of those are relevant to this thread.
What is relevant is the new maps mod, which adds a "flat lands" terrain type for a map that only has hills on the edges.
It can be found here
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