Umatilla County is located in the northeastern part of the state of Oregon, USA. It covers an area of approximately 3,231 square miles and is known for its diverse landscapes, including mountains, rivers, and agricultural land. The county seat is Pendleton, which is famous for its annual Round-Up rodeo. The population of Umatilla County is around 80,000 residents, with a mix of urban and rural communities. The economy is primarily driven by agriculture, with crops like wheat and potatoes being significant contributors. The county also offers outdoor recreational activities, including hiking, fishing, and camping in its natural parks.