Niue is an island country in the South Pacific Ocean, 2,400 kilometres (1,500 mi) northeast of New Zealand. Niue's land area is about 261 square kilometres (101 sq mi) and its population, predominantly Polynesian, was about 1,600 in 2016. Niue is located 2,400 kilometres northeast of New Zealand in a triangle between Tonga, Samoa, and the Cook Islands. It is 604 kilometers northeast of Tonga. The island is commonly referred to as "The Rock", which comes from the traditional name "Rock of Polynesia". Niue is one of the world's largest coral islands. The terrain of the island has two noticeable levels. The higher level is made up of a limestone cliff running along the coast, with a plateau in the centre of the island reaching approximately 60 metres above sea level. The lower level is a coastal terrace approximately 0.5 km wide and about 25–27 metres high, which slopes down and meets the sea in small cliffs. A coral reef surrounds the island, with the only major break in the reef being in the central western coast, close to the capital, Alofi.