The Maro Reef and Hawaiian Nalukākala are a labyrinth of coral reefs on the islands of Hawaii's Leeward Islands. It is located 1370 km northwest of Honolulu. Its coordinates are: 25 ° 25'N 170 ° 35'O / 25.417, -170.583.

The reef is the remnant of a submerged atoll that is flush with the water at low tide. It is the largest reef in Hawaii, with 37 species of coral. It was discovered in 1820, by the American captain Joseph Allen. The reef was named after its ship, the Marant of Nantucket, the first whaler to arrive at the port of Honolulu.

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