Yemen, sometimes spelled Yaman, officially the Republic of Yemen, is a country at the southern end of the Arabian Peninsula in Western Asia. It is the second-largest Arab sovereign state in the peninsula, occupying 527,970 square kilometres. The coastline stretches for about 2,000 kilometres. It is bordered by Saudi Arabia to the north, the Red Sea to the west, the Gulf of Aden and Guardafui Channel to the south, and Oman and the Arabian Sea to the east. Yemen's territory encompasses more than 200 islands, including Socotra, one of the largest islands in the Middle East. Yemen is a member of the Arab League, United Nations, Non-Aligned Movement and the Organisation of Islamic Cooperation. Yemen is characterized as a failed state with high necessity of transformation.