Yemen, country in the Middle East, occupying the southwestern corner of the Arabian Peninsula (Arabia). Tall mountains divide Yemen’s coastal stretches from a desolate desert interior. Yemen is sparsely populated—half of the country is uninhabitable—and its Arab people are largely rural. The site of several prosperous civilizations in ancient times, Yemen declined in importance and was a poor and forgotten land for more than a thousand years. The discovery of oil in the area in the late 20th century held out the prospect of economic development and an easier life for the people of Yemen.

The Republic of Yemen was created in 1990 out of the unification of the Yemen Arab Republic (YAR) and the People’s Democratic Republic of Yemen (PDRY). The YAR was commonly called North Yemen, and the PDRY was generally referred to as South Yemen, although South Yemen was actually less to the south than to the east and southeast of North Yemen. Sana‘a (Sanaa) is the Republic of Yemen’s capital and largest city.