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Bay-to-BayBay-to-Bay Comparison
| Category | San Francisco Bay | Tokyo Bay |
| Longitude | 122.24 W | 139.46 E |
| Latitude | 37.48 N | 35.40 N |
| Surface area of bay | 1,600 square miles (estuary) | |
| Depth of bay | 70% is less than 18 feet, deepest point is 357 feet | |
| Watershed area of bay | Drains 40% of California (60,000 square miles and 47% of the state’s total runoff) | |
| Number of fish species | Over 120 | |
| Major rivers flowing into bay |
Sacramento, San Joaquin | Sumida River |
| Populations of largest cities (1990) | San Jose: 782,248 San Francisco: 723,959 Oakland: 372,242 |
Tokyo: 8.1 million Yokohama: Kawasaki: |
| Year of city’s founding | San Francisco: 1850 | Tokyo: 1457 |
| Area of city | San Francisco: 46.7 sq mi | Tokyo: 223 sq mi/578 sq km |
| Population of metropolitan area | 7 million (4th largest in United States) | 28 million (largest in Japan, 25% of the country’s population) |
| Population of country | 250 million | 123 million |
| Region’s largest port | Oakland | Yokohama |
| Demographics/Ethnic population | 1% minority (mostly Korean) | |
| Population density | 15,608 | 37,000 per square mile |
| Average temperature | 58 F° (14 C) | 58° F (14 C) |
| Minimum mean temperature | 51° F (11 C) | 40° F (4 C) |
| Maximum mean temperature | 63° F (17° C) | 79° F (26 C) |
| Average precipitation | 21 inches (79 cm) | 57 inches (146 centimeters) |
| Origin/meaning of city name |
Namesake: St. Francis of Assisi | Formerly called Edo; Tokyo means “Eastern Capital” |