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Nixes Mate also known as Nixes Island Nix’s Mate and Nick’s Mate is one of the smaller islands in the Boston Harbor Islands National Recreation Area. Located in Boston Harbor’s outer limits near the convergence of three major channels the island lies about 5 nautical miles (9.3 km; 5.8 mi) from downtown Boston and about 0.6 nautical miles (1.1 km; 0.69 mi) east of Long Island Head Light. The island covers and uncovers with the tide and is not open to the public.