The Bedouin, Beduin, or Bedu are pastorally nomadic Arab tribes who have historically inhabited the desert regions in the Arabian Peninsula, North Africa, the Levant, and Mesopotamia (Iraq). The Bedouin originated in the Syrian Desert and Arabian Desert but spread across the rest of the Arab world in West Asia and North Africa after the spread of Islam. The English word bedouin comes from the Arabic badawī, which means "desert-dweller", and is traditionally contrasted with ḥāḍir, the term for sedentary people. Bedouin territory stretches from the vast deserts of North Africa to the rocky ones of the Middle East. They are sometimes traditionally divided into tribes, or clans, and historically share a common culture of herding camels, sheep and goats. The vast majority of Bedouins adhere to Islam, although there are some fewer numbers of Christian Bedouins present in the Fertile Crescent.