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The Cook Islands (Rarotongan: Kūki ‘Airani; Penrhyn: Kūki Airani) is an island country in Polynesia, part of Oceania in the South Pacific Ocean. It consists of 15 islands whose total land area is approximately 236.7 square kilometres (91 sq mi). The Cook Islands' Exclusive Economic Zone (EEZ) covers 1,960,027 square kilometres (756,771 sq mi) of ocean. Avarua is its capital.

The Cook Islands is self-governing while in free association with New Zealand. Since the start of the 21st century, the Cook Islands has directed its own independent foreign and defence policy, and also has its own customs regulations, although it has no armed forces and therefore generally relies on New Zealand for its external defence. In recent decades, the Cook Islands have adopted an increasingly assertive and distinct foreign policy, and a Cook Islander, Henry Puna, currently serves as Secretary General of the Pacific Islands Forum. Most Cook Islanders are also citizens of New Zealand, but they also have the status of Cook Islands nationals, which is not given to other New Zealand citizens. The Cook Islands have been an active member of the Pacific Community since 1980.

The Cook Islands' main population centres are on the island of Rarotonga (10,863 in 2021). The Rarotonga International Airport, the main international gateway to the country, is located on this island. The census of 2021 put the total population at 14,987. There is also a larger population of Cook Islanders in New Zealand and Australia: in the 2018 New Zealand census, 80,532 people said they were Cook Islanders, or of Cook Islands descent. The last Australian census recorded 28,000 Cook Islanders living in Australia, many with Australian citizenship. With over 168,000 visitors to the islands in 2018, tourism is the country's main industry and leading element of its economy, ahead of offshore banking, pearls, and marine and fruit exports.