Tanna (sometimes spelled Tana) is an island of Vanuatu. It is 40 km (25 mi) long and 19 km (12 mi) wide, with a total area of 550 km² (212 sq mi). Its highest point is the 1,084 m (3,556 ft) summit of Mount Tukosmera in the south of the island. In the east, northeast of the peak, close to the coast, is where Lake Siwi was located until mid April 2000 when, following unusually heavy rain, the lake burst down the valley into Sulphur Bay, destroying the village with no loss of life. It is the most populous island in Tafea province, with a population of about 20,000, and one of the more populous islands in the country. Isangel, the provincial administrative capital, is on the west coast near the island's largest town of Lénakel. Mount Yasur is the most accessible active volcano in the world, located on the southeast coast.