Niʻihau or Niihau (/ˈniːhaʊ/; Hawaiian: [ˈniʔiˈhau]) is the westernmost and seventh largest of the inhabited Hawaiian Islands in the U.S. state of Hawaiʻi, lying 17.5 miles (15.2 nmi; 28.2 km) southwest of Kauaʻi across the Kaulakahi Channel and having an area of 69.5 square miles (180 km2). Several intermittent playa lakes provide wetland habitats for the Hawaiian coot, the black-winged stilt, and the Hawaiian duck.