Funafuti is an atoll on which the capital of the island nation of Tuvalu is located. It has a population of 6,025 people, making it the most populated atoll with 56.6 percent of Tuvalu's population. It is a narrow sweep of land between 20 and 400 metres (66 and 1,312 feet) wide, encircling a large lagoon 18 km (11 miles) long and 14 km (9 miles) wide. With a surface of 275 square kilometres (106.2 sq mi), it is by far the largest lagoon in Tuvalu. The land area of the 33 islets aggregates to 2.4 square kilometres (0.9 sq mi), less than one percent of the total area of the atoll.