cities of the great arab world

The Arab world (Arabic: العالم العربي‎ al-ʿālam al-ʿarabī; formally: Arab homeland, الوطن العربي al-waṭan al-ʿarabī),[7][8][9] also known as the Arab nation (الأمة العربية al-ummah al-ʿarabīyyah) or the Arab states,[10] currently consists of the 22 Arab countries of the Arab League.[6] These Arab states occupy an area stretching from the Atlantic Ocean in the west to the Arabian Sea in the east, and from the Mediterranean Sea in the north to the Horn of Africa and the Indian Ocean in the southeast.[6] The contemporary Arab world has a combined population of around 422 million inhabitants, over half of whom are under 25 years of age.[11]

In the Middle Ages, the Arab world was synonymous with the historic Arab empires and  caliphates. Arab nationalism arose in the second half of the 19th century along with other nationalist movements within the  Ottoman Empire. The Arab League was formed in 1945 to represent the interests of Arab people and especially to pursue the political unification of the Arab countries; a project known as Pan-Arabism.[12][13]Source