The Columbia Plateau is a large, flat region located in the northwestern United States, primarily in the states of Washington, Oregon, and Idaho. It is characterized by its volcanic rock formations and fertile soil, which were formed by ancient lava flows. The plateau is part of the larger Columbia River Basin and is bordered by the Cascade Range to the west and the Rocky Mountains to the east. This area is known for its agriculture, particularly the cultivation of crops like wheat and grapes. The Columbia River runs through the plateau, providing essential water resources for irrigation. The region's unique geology and climate contribute to its diverse ecosystems, making it an important area for both wildlife and human activities.