California is a state located on the west coast of the United States and is home to many rivers. The EEL River is a major river in northern California, running approximately 196 miles from its source in the Coast Range Mountains to its mouth at Humboldt Bay. The Napa River is a 55-mile long river that flows through the Napa Valley in California. The Shasta River is a tributary of the Klamath River, originating in the Cascade Range in Siskiyou County, California. The Santa CLARA River is a river in Ventura County, California, that flows for 83 miles from the Santa Susana Mountains to the Pacific Ocean. The Santa ANA River is the longest river in Southern California, flowing for 143 miles from the San Bernardino Mountains to the Pacific Ocean. The Big Sur River is a river in Monterey County, California, that flows for approximately 24 miles from the Ventana Wilderness to the Pacific Ocean. The San Joaquin River is the longest river in Central California, running for approximately 350 miles from the Sierra Nevada Mountains to the San Francisco Bay.