Aitutaki, also traditionally known as Araʻura and Utataki, is one of the Cook Islands, north of Rarotonga. It has a population of approximately 2,000. Aitutaki is the second most visited island of the Cook Islands. The main village is Arutanga (Arutunga) on the west side.
Aitutaki is sometimes described as an “almost atoll”, for it consists of a lagoon within an encircling atoll, with a significant area of high land on one side. It has a maximum elevation of approximately 123 metres (404 ft) with the hill known as Maunga Pu close to its northernmost point. The land area of the atoll is 18.05 km² (6.97 sq mi), of which the main island occupies 16.8 km² (6.5 sq mi). The Ootu Peninsula, protruding east from the main island in a southerly direction along the eastern rim of the reef, takes up 1.75 km² (0.68 sq mi) out of the main island. For the lagoon, area figures between 50 and 74 km² (19 and 29 sq mi) are found. Satellite image measurement suggests that the larger figure also includes the reef flat, which is commonly not considered part of a lagoon.