The Umatilla River is a tributary of the Columbia River, located in northeastern Oregon and southeastern Washington. It flows approximately 120 miles through the Umatilla National Forest and the city of Pendleton, providing vital water resources for agriculture and wildlife in the region. The river is known for its diverse ecosystems, supporting various fish species, including steelhead trout and salmon. It also offers recreational opportunities such as fishing, kayaking, and hiking along its scenic banks, making it an important natural asset for both locals and visitors.