Atiu, also known as Enuamanu (meaning land of the birds), is an island 187 km northeast of Rarotonga, in the Southern Islands group of the Cook Islands Archipelago.
Atiu is a raised volcanic island surrounded by a reef from which rise 6-metre-high (20-foot) cliffs of fossilized coral (makatea). The makatea cliff forms a one-mile-wide (1.6-kilometre) ring round the island, creating a virtual plateau. Erosion at the innerside of the ring has formed dip of about 30 metres (98 feet) into fertile land, which gradually rises again to a central 70-metre-high (230-foot) flat-topped hill.
Administratively, Takutea is considered part of Atiu.
Atiuans trace their ancestry from Tangaroa, the principal god of Atiu and universally recognised in Polynesia as tutelary god of the sea. Atiu's area is about half that of Rarotonga. The low swampy land consists of taro plantations, marshes and a lake, Te Roto. This fertile area also grows bananas, citrus fruits, pawpaws, breadfruit and coconuts. The ancient name of the island was Enuamanu, meaning the island of insects and animals, although there is some dispute over whether 'animals' includes 'insects'. The Atiuans understand it as meaning there were no previous inhabitants. The Atiuans call themselves 'worms of Enuamanu' because they were born on Atiu and hope to be buried there. There was once a custom on Atiu similar to that of New Zealand Maori of burying a newborn child's placenta under a newly planted tree. This is the origin of the Atiuan saying: "We come from the land and go back to the land." The Atiuans were a fierce, warrior people and before the arrival of the missionaries busied themselves with making war on their neighbors on Mauke and Mitiaro, slaughtering and eating significant numbers of them.
The first recorded European to arrive to Atiu was Captain Cook. He sighted the island on March 31, 1777 and made tentative contact with some of the people over the next few days.
In common with most islands in the southern group, Atiu has only a small, shallow lagoon. It compensates, however, with many picturesque, sandy beaches. As is usual with the makatea islands of the southern group, the fossilised coral limestone abounds with caves filled with stalactites and stalagmites. One in particular, the Anatakitaki Cave, is inhabited by tiny kopeka (Atiu swiftlet - Aerodramus sawtelli) birds which navigate in the dark using sonar, like bats. Male visitors can enjoy the esoteric delights of the "tumunu" or bush beer party.