Tuesday, October 20, 2026

Question: San Francisco Bay is the West Coast’s largest estuary. Which two major rivers supply much of its fresh water, converging in the Delta before flowing into the bay?

Answer: The Sacramento River and the San Joaquin River. California’s two largest rivers carry runoff from a vast watershed that drains roughly 40% of the state’s landmass, helping sustain the Bay’s rich ecosystem of fish, birds and wetlands.