San Pablo Bay City is the city of Vallejo, California. It is located in the San Francisco Bay Area and is the tenth most populous city in the state. Vallejo is known for its rich history, vibrant culture, and diverse population. It is home to a number of attractions, including Six Flags Discovery Kingdom, Mare Island Naval Shipyard, and the Vallejo Naval and Historical Museum. Vallejo is also a popular destination for outdoor activities such as hiking, biking, and kayaking.