False-colour Landsat image of the San Francisco Bay area, California, showing the cities of San Francisco (occupying the peninsula at upper left), San Jose (bottom right) & Oakland (top centre). Four bridges are visible; the Golden Gate Bridge (bridging the entrance to the bay at upper left), the Bay Bridge (top right), the San Mateo Bridge (centre) & the Dumbarton Bridge (bottom). Surrounding the bottom end of the bay is a blue patchwork of salt beds. The colours are due to different populations of algae, indicating varying salinities. The two lakes to the south of San Francisco mark the path of the San Andreas Fault.

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