Yemen - sovereign country located on the southern portion of the Arabian Peninsula in Southwest Asia. With a population of more than 20 million people, Yemen is bordered by Saudi Arabia to the North, the Red Sea to the West, the Arabian Sea and Gulf of Aden to the South, and Oman to the east. Yemen's territory includes over 200 islands, the largest of which is Socotra, about 415 kilometres (259 miles) to the south of Yemen, off the coast of Somalia. Yemen is the only republic on the Arabian Peninsula.