Dammam (الدمام,ad-Dammām) is the largest city in the Eastern Province of Saudi Arabia, and the 3rd largest city in the kingdom after Riyadh and Jeddah.
Khobar (Al-Khobar, Al-Khubar) is a city in the Eastern Province of Saudi Arabia.
Manama (Arabic: المنامة, transliteration: al-Manāma) is the capital and largest city of Bahrain with an approximate population of 157,000 people, roughly a quarter of the country's population.
Muharraq is a metropolitan area in Bahrain, an island connected to the northeast of the capital of Manama.
Jubail (الجبيل , Al Jubayl) is a city in the Eastern Province of Saudi Arabia, on the Persian Gulf coast.
Al Ruwais, also spelt Ar Ru'ays, is the northernmost city of the Qatar peninsula. With a population of just under 4,000 people, it is little more than a sleepy fishing village, the seaside teeming with local dhow boats.
Dukhan is an industrial city in the western reaches of Qatar. Dukhan was founded when oil was first discovered in the region, and its purpose has not changed since.