(Al-Yaman), officially the Republic of Yemen (Arabic: al-Jumhuuriyya al-Yamaniyya) is a Middle Eastern country located on 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. The land of Yemen is one of the oldest centers of civilization in the world. Between 2300 BC and the sixth century AD, it was part of the Sabaean, Awsanian, Minaean, Qatabanian, Hadhramawtian, Himyarite, and some other kingdoms, which controlled the lucrative spice trade. It was known to the ancient Romans as Arabia Felix ("Happy Arabia") because of the riches its trade generated. Augustus Caesar attempted to annex it, but...