That's a very "NA excuse" and you are not coming from NA. One can tell at a glance the inspiration was heavily drawn from Savage's Eden. I can't help but mention the Eden map from Savage 1 has plenty of water going.

Oy, oy! That's not true. I made it from scratch in Cultures' Map Editor.
As for differences, there are mountains in both maps, but no river on Eden. Just few water sources.

This map is a copycat of Eden from Savage 2. Please explain. Also, Savage 2 is being re-released with some fixes and stuff since we have the source code.