Aransas National Wildlife Refuge Aransas National Wildlife RefugeStation reference point Matagorda North (Open)18,962 acres Blackjack North (Special regs)19,738 acres Blackjack South (Special regs)15,946 acres Closed Area (Closed)17,177 acres Matagorda South (Closed)11,563 acres Tatton (Closed)7,383 acres