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The United Arab Emirates is an Arabian Peninsula nation settled mainly along the Persian (Arabian) Gulf. The country is a federation of 7 emirates. Abu Dhabi, the island capital, is home to Sheikh Zayed Grand Mosque, with crystal chandeliers and room for 40,000 worshipers. Dubai is the site of ultramodern Burj Khalifa tower, enormous shopping centers and extravagant entertainment attractions. Dubai is the top tourism destination in the Middle East. According to the annual MasterCard Global Destination Cities Index, Dubai is the fifth most popular tourism destination in the world. Dubai holds up to 66% share of the UAE's tourism economy, with Abu Dhabi having 16% and Sharjah 10%. Dubai welcomed 10 million tourists in 2013. Between 2014 and 18, the accommodation and food, education, information and communication, arts and recreation, and real estate sectors overperformed in terms of growth, whereas the construction, logistics, professional services, public, and oil and gas sectors underperformed. The UAE has the most advanced and developed infrastructure in the region.