atoll of the northern Cook Islands, a self-governing state in free association with New Zealand in the South Pacific Ocean. A coral formation, it has a lagoon that lacks clear passage to the open sea. Covered with coconut and pandanus groves, it exports copra. Although there is evidence of a previous occupation by Polynesians, the island was uninhabited when visited by Capt. James Cook in 1774. Its current inhabitants are of mixed Polynesian and English descent; they are descendants of William Marsters, who settled the island in 1862 with his Rarotongan wives. They speak an unusual dialect that combines English and Penrhynese, or Tongarevan, a dialect of Cook Island Maori spoken in the northern islands. Land area 0.8 square mile (2.1 square km). Pop. (2006 prelim.) 63.