A coulee is a type of landform characterized by a deep, narrow valley or ravine, often formed by the erosion of soil and rock. These features are commonly found in regions with a history of glacial activity, where melting glaciers have carved out the landscape. Coulees can vary in size and shape, and they often contain streams or rivers that flow through them. In North America, particularly in the Great Plains and Northwest, coulees are prevalent and can be seen in various states, including Washington and Montana. They play an important role in local ecosystems, providing habitats for wildlife and serving as natural drainage systems for surrounding areas.