Port Costa, California — Islands
Islands Near Port Costa, California
Nearest Islands by Distance
| # | Island | Distance |
|---|---|---|
| 1. | Mare Island | 5.9 mi. |
| 2. | Morrow Island | 7.2 mi. |
| 3. | Seal Islands | 7.4 mi. |
| 4. | Roe Island | 8.3 mi. |
| 5. | Knight Island | 8.8 mi. |
| 6. | Ryer Island | 9.5 mi. |
| 7. | Joice Island | 9.8 mi. |
| 8. | Freeman Island | 11 mi. |
| 9. | Island Number One | 11 mi. |
| 10. | Middle Ground Island | 11 mi. |
Island Locations