The Sacramento–San Joaquin Delta lies at the confluence of two of the state’s largest rivers. Forty percent of California’s runoff flows into the Delta, which—together with the San Francisco Bay—forms one of the West Coast’s largest estuaries. The Delta watershed supplies water to roughly 30 million residents and more than 6 million acres of farmland. Water exported from the Delta goes to the Bay Area, the southern San Joaquin Valley, the Central Coast, and Southern California (first figure).