Oakland is in the eastern region of the San Francisco Bay. In 1991 the City Hall tower was at 37°48′19″N 122°16′21″W / 37.805302°N 122.272539°W / 37.805302; -122.272539 (NAD83). (The building still exists, but like the rest of the Bay Area, it has shifted northwest perhaps 0.6 meters in the last twenty years.)
The United States Census Bureau says the city's total area is 78.0 square miles (202 km2), including 55.8 square miles (145 km2) of land and 22.2 square miles (57 km2) (28.48 percent) of water.
Oakland's highest point is near Grizzly Peak Blvd, east of Berkeley, just over 1,760 feet (...
Source: Wikipedia (as of 04/11/2019). Read more from Wikipedia