Bahía de San Francisco, or the San Francisco Bay, is a large estuary located in Northern California. It is surrounded by several cities, including San Francisco, Oakland, and San Jose. The bay is known for its iconic landmarks, such as the Golden Gate Bridge and Alcatraz Island, and serves as a vital shipping and transportation hub. The bay is also home to diverse ecosystems, including wetlands and tidal marshes, which support various wildlife species. It plays a crucial role in the region's economy and recreation, offering activities like boating, fishing, and hiking along its scenic shores.