Niihau is the smallest of the inhabited Hawaiian Islands in the U.S. State of Hawaii, having an area of 179.9 km² (69.5 sq mi). Known as the "Forbidden Isle", Niihau lies 17.5 miles (28 km) across the Kaulakahi Channel, southwest of Kauai, and the crescent-shaped island of Lehua is positioned 0.7 miles (1.1 km) north of Niihau.
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