Nukunonu, formerly known as Duke of Clarence Island, is the largest atoll within Tokelau, a dependency of New Zealand in the south Pacific Ocean. It comprises 30 islets surrounding a central lagoon, with about 5.5 km2 (2.1 sq mi) of land area and a lagoon surface area of 109 km2 (42 sq mi). Motuhaga is the only islet that has inhabitants. It has an estimated population of 531.

Tokelau is a dependent territory of New Zealand in the southern Pacific Ocean. It consists of three tropical coral atolls: Atafu, Nukunonu, and Fakaofo. They have a combined land area of 10 km2 (4 sq mi). In addition to these three, Swains Island, which forms part of the same archipelago, is the subject of an ongoing territorial dispute; it is currently administered by the United States as part of American Samoa. Tokelau lies north of the Samoan Islands, east of Tuvalu, south of the Phoenix Islands, southwest of the more distant Line Islands, and northwest of the Cook Islands.