evidence: Socotra, island in the Indian Ocean about 210 miles (340 km) southeast of Yemen, to which it belongs. The largest of several islands extending eastward from the Horn of Africa, it has an area of about 1,400 square miles (3,600 square km). The Hajīr (Hajhir) Mountains occupy Socotra’s interior, whereas narrow coastal plains lie in the north and a broader plain in the south. To the southwest and west are the smaller islands of Samḥah and Darzah, called al-Ikhwān ("the Brothers"), and ʿAbd al-Kūrī, all of which also belong to Yemen. The islands stand on coral banks and may once have been connected with the African and Arabian mainlands. Socotra’s flora includes several famous species, among them myrrh, frankincense, and the dragon’s blood tree. In recognition of its distinct plant and animal life, the archipelago was designated a UNESCO World Heritage site in 2008. Socotra’s name is traced to the Sanskrit dvipa-sakhadara, "island abode of bliss." The island is mentioned in various legends. The inhabitants long were Christians, but that religion disappeared from the island in the 17th century. Socotra was long ruled by the Mahra sultans of southeastern Yemen. Their rule on Socotra was interrupted by Portuguese occupation between 1507 and 1511. In 1834 the British tried and failed to purchase the island; in the 1880s, however, the sultan accepted British protection for the entire sultanate. The sultanate came to an end in 1967, when Socotra became part of independent South Yemen, and later, unified Yemen.