Tristan da Cunha ( ()/), colloquially Tristan, is both a remote group of volcanic islands in the south Atlantic Ocean and the main island of that group. It is the most remote inhabited archipelago in the world which lies proximately 1,511 miles (2,432 km) off the coast of Cape Town in South Africa, 1,343 miles (2,161 km) from Saint Helena and 2,166 miles (3,486 km) off the coast from the Falkland Islands. The territory consists of the main island, Tristan da Cunha, which has a north–south length of 11.27 kilometres (7.00 mi) and an area of 98 square kilometres (38 sq mi), and the smaller, uninhabited Nightingale Islands and the wildlife reserves of Inaccessible and Gough islands. As of October 2018, the main island has 250 permanent inhabitants who all carry British Overseas Territories citizenship. The other islands are uninhabited, except for the personnel of a weather station on Gough Island.