The island of Socotra constitutes around 95% of the landmass of the Socotra archipelago. It lies some 240 kilometres (150 mi) east off the coast of Cape Guardafui and 380 kilometres (240 mi) south of the Arabian Peninsula. The island is very isolated, home to a high number of endemic species; up to a third of its plant life is endemic. It has been described as "the most alien-looking place on Earth." The island measures 132 kilometres (82 mi) in length and 49.7 kilometres (30.9 mi) in width.