San Luis National Wildlife Refuge San Luis National Wildlife RefugeStation reference point Blue Goose Unit (Special regs)85 acres Kesterson Unit (Special regs)4,381 acres North Freitas Unit (Special regs)2,318 acres San Luis Unit (Special regs)2,565 acres South Freitas Unit (Special regs)126 acres Upland Freitas Unit (Special regs)671 acres Closed (Closed)7,670 acres