Yeah, you could write about the ocean. I mean, ocean is going to kind of protect and create isolationism. I mean, look at South America. You have giant golden civilizations down there with the Incas, the Aztecs, and the Mayans that just putter out. They putter out because they don't have access to new technology or they don't have access to trade routes and they don't have cultural diffusion because they're trapped by water on either side. And they have the Andes Mountains. Then they have the Amazon jungle.