Map: https://imgur.com/a/ZP70D0v

RP: The Tedeshani people have noticed that crops grow better when adjacent to freshwater rivers. They've also noticed that they can fish in these rivers for fishies, and that they can drink from these rivers to not die of thirst. So, over the generations, Tedeshani villages have slowly sprung up on the northern banks of their great river, as Tedeshan living in less ideal inland settlements migrate to the river. In addition, the Tedeshani hooligans who constantly get exiled from existing Tedeshani coastal and riverine settlements also establish new homes on the river, where there's no existing villagers to throw them out.

Similarly, the Tedeshan have noticed that wood is required to make boats, housing (the Tedeshan have yet to invent stacking rocks on top of each other), and tools. The Tedeshan have also noticed that saltwater seas provide larger and swankier fishies than their silly freshwater river does. So, in a manner similar to that described above, the Tedeshan have over the generations established villages to the west, in the (presumably, if I'm guessing the foggy map correctly) coastal scrublands, which are the closest thing the Tedeshan have to proper forests.