San Francisco Bay is the largest bay along the Pacific Coast, known for its vast expanse and key role in maritime trade.

San Francisco Bay, located in Northern California, is the largest bay on the Pacific Coast in terms of both area and importance. It spans approximately 1,600 square miles, including its delta and estuary system. It serves as a major hub for shipping, commerce, and recreation. Puget Sound in Washington is significant but smaller, while Monterey Bay and Prince William Sound (in Alaska) are also smaller by area