| Pushpin Map: | United States San Francisco Bay Area#USA California#USA |
| Coordinates: | 37.9883°N -122.4411°W |
| Location: | Northern California |
| Waterbody: | San Pablo Bay |
| Area Sqft: | or |
| Area Acre: | --> |
| Length Ft: | --> |
| Width Ft: | --> |
| Coastline Ft: | --> |
| Country: | United States |
| Country Admin Divisions Title: | State |
| Country Admin Divisions Title 1: | County |
| Country Admin Divisions 1: | Marin |
The Sisters are two small rock islands in San Pablo Bay, located 500m (1,600feet) northeast of Point San Pedro in Marin County, California.
The Sisters were shown in an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold. They, along with The Brothers on the opposite side of the San Pablo Strait, were reserved for military purposes by order of President Andrew Johnson in 1867. After many a court battle the plans were scrapped.