Cascadia is a big area in the Pacific Northwest of North America, made up of parts of the United States and Canada. It's named after the Cascade Range of mountains that run through the area. It includes places like Seattle, Portland, Vancouver, and is mostly made up of forests, rivers, and big mountains.
People who live in Cascadia often feel connected to the land and the environment, and they share values like sustainability and community cooperation. Some people think that Cascadia should be its own separate country, but right now it's still part of the US and Canada. Overall, it's a really cool place with lots of natural beauty and unique culture.