A coulee is a geographical term used to describe a deep, steep-sided ravine or gully, often formed by the erosion of water. These landforms are typically found in regions with soft soil or sediment, where water flow can carve out the landscape over time. Coulees can vary in size and shape, and they often lead to rivers or lakes. In North America, particularly in the Great Plains and Northwest, coulees are common features. They can be created by glacial activity or by the natural flow of rivers. Coulees are important for local ecosystems, providing habitats for various plants and animals.