Sacramento & San Joaquin Rivers
The Sacramento (380 miles) (610 km) in length, begins in the Klamath Mountains of northern California, flowing southwest, then south to join the San Joaquin River, before entering San Francisco Bay. The San Joaquin comes out of the Sierra Nevada near Yosemite National Park. It flows north to meet the Sacramento River, east of San Francisco. It's namesake valley is one of the most fertile agricultural regions in the USA. (350 miles) (563 km) in length.