It is a wide body of water in California, located between the San Francisco Peninsula and the East Bay. It is the largest harbor in California and one of the most important ports on the West Coast. Connected to the Pacific Ocean through the Kinmen Strait, this strait is the location of the famous Kinmen Bridge. It is an important shipping center with important ports such as Oakland Port and San Francisco Port, supporting the economy and international trade of the region. In addition, it is also a habitat for various marine organisms, including fish, birds, and mammals, and is an important area of ecological diversity. It is loved by people for its beautiful natural scenery and mild Mediterranean climate.