California is home to many significant rivers that play a crucial role in the state's ecology and economy. The Sacramento River is the longest river in California, flowing over 400 miles from the Klamath Mountains to the Sacramento-San Joaquin Delta. Other important rivers include the San Joaquin River, which also contributes to the delta, and the American River, known for its recreational opportunities. These rivers provide essential water resources for agriculture, drinking, and industry. They support diverse ecosystems, including habitats for fish and wildlife. Additionally, rivers like the Russian River and Merced River are popular for activities such as fishing, kayaking, and hiking, attracting both locals and tourists.