Back Bay National Wildlife Refuge Back Bay National Wildlife RefugeStation reference point Zone 1 (Special regs)842 acres Zone 2 (Special regs)105 acres Zone 3 (Special regs)148 acres Zone 4 (Special regs)313 acres Zone 5 (Special regs)70 acres Zone 6 (Special regs)222 acres Zone 7 (Special regs)189 acres Zone 8 (Special regs)339 acres Closed (Closed)6,573 acres