Don Edwards San Francisco Bay National Wildlife Refuge Don Edwards San Francisco Bay National Wildlife RefugeStation reference point A6 (Open)451 acres A19 (Open)300 acres Bair Island (Open)1,954 acres Greco Island (Open)1,174 acres M1 (Open)496 acres M2 (Open)610 acres M3 (Open)544 acres M4 (Open)529 acres M5 (Open)413 acres M6 (Open)440 acres R1 (Open)454 acres R2 (Open)133 acres A2E (Special regs)335 acres A3N (Special regs)164 acres A3W (Special regs)575 acres A5 (Special regs)640 acres A7 (Special regs)267 acres A8 (Special regs)597 acres AB1 (Special regs)154 acres AB2 (Special regs)147 acres Closed (Closed)17,762 acres