Kaoa

Kaoa (Rarotongan: kāoa, literally meaning 'coral rock in the lagoon') is a term used in three atolls of the Cook Islands for small coral rocky outcrops that are the base for pearl farming. The three atolls, with their respective Kaoa areas, are:
 * Penrhyn (15.0 km2)
 * Manihiki (5.0 km2)
 * Rakahanga (1.6 km2)