Geography of the British Virgin Islands
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Through Archipelago, Atlantic Ocean and Tectonics
Terrain
The majority of the islands are steep and hilly due to their volcanic origin. The lowest point of the island chain is the Caribbean Sea while the highest point is Mount Sage at 521 metres (1,709 ft) above sea level and there are 80 kilometres (50 mi) of coastline. Other than Anegada, the islands are composed of pyroclastic rock and mixed deposits of diorite and tonalite Anegada is geologically distinct, being composed of carbonate reef deposits. The entire archipelago, together with Puerto Rico to the west, is the above-water high points on an underwater ridge that was once a continuous land mass during the Pleistocene epoch. This bank formed from tectonic forces at the boundary where the Caribbean Plate collides with the North American Plate. In the British Virgin Islands forest cover is around 24% of the total land area, equivalent to 3,620 hectares (ha) of forest in 2020, down from 3,710 hectares (ha) in 1990.
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Settlements
The capital of the territory and the main port of entry for yachts and cruise ships visiting the BVI is Road Town on Tortola. In 2010, The United Nations found that 83% or the BVI population lived on Tortola, making Road Town the largest population center of the islands.
Spanish Town on Virgin Gorda, also known as "The Valley", is the second largest settlement and the original capital of the territory. Virgin Gorda was mined for copper in the 17th through 19th centuries but declined when the mine closed in 1867. The creation of a yacht harbour and resort by Laurance Rockefeller in the early 1960s turned Spanish Town into a wealthy tourist destination.
Residents on Jost van Dyke, Anegada, Cooper lsland, Great Camanoe Island and other locations collectively make up just over 2% of the population.
Climate
The British Virgin Islands have a tropical savanna climate, moderated by the trade winds. Temperatures vary little throughout the year. In the capital, Road Town, typical daily maxima are around 32 °C (89.6 °F) in the summer and 29 °C (84.2 °F) in the winter. Typical daily minima are around 24 °C (75.2 °F) in the summer and 21 °C (69.8 °F) in the winter. Rainfall averages about 1,150 mm (45.3 in) per year, higher in the hills and lower on the coast. Rainfall can be quite variable, but the wettest months on average are September to November and the driest months on average are February and March. Hurricanes occasionally hit the islands, with the hurricane season running from June to November.