The island of Socotra constitutes around 95% of the landmass of the Socotra Archipelago. It lies south of the Arabian Peninsula. While politically a part of Yemen (part of the Arabian Peninsula and thus Western Asia), Socotra and the rest of its archipelago geographically are part of Africa. 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 in length and in width. In 2008 Socotra was recognised as a UNESCO World Heritage Site.