The really wet, marshy jungles of South America, that's going to create a lack of cultural diffusion and separate different, you know, distinct cultures that are going to grow up because of that because it separates and it divides. And then I would think deserts. I mean, the Sahara Desert in Africa, in lower Africa, and the Kalahari in the Middle East. I'm messing up my deserts. That's a shame. But deserts are definitely going to be something easy to write about. Write about how they separate African cultures and that they don't allow for trade and they allow for more tribalism and isolationism and that's not always a great thing.