The territory includes the island of Wallis (the most populous), the island of Futuna, the uninhabited island of Alofi (the population of Alofi was reportedly eaten by the cannibal people of Futuna in one single raid in the 19th century), and 20 uninhabited islets, totaling 274 square kilometres (106 sq mi) with 129 kilometres (80 mi) of coastline. The highest point in the territory is Mont Singavi (on the island of Futuna) at 765 metres (2,510 ft).The islands have a hot, rainy season from November to April and a cool, dry season from May to October. The rains accumulate 2,500 to 3,000 millimetres (98–118 in) each year. The average humidity is 80% and the temperature 26.6 °C (79.9 °F). Only five percent of the islands' land area is arable land; permanent crops cover another 20%. Deforestation (only small portions of the original forests remain), largely as a result of the continued use of wood as the main fuel source, is a serious problem; as a consequence of cutting down the forests, the mountainous terrain of Futuna is particularly prone to erosion. There are no permanent settlements on Alofi because of the lack of natural fresh water resources. The two island groups lie about 260 km apart: