The Persian/Arabian gulf's leading city in terms of business, entertainment, and consumer services is Dubai. It is the largest city in the United Arab Emirates with a large population of about 2.8 M people. The city has prospered primarily due to revenues from trade. Its development was further accelerated upon the discovery of oil in 1969. Nowadays, it is known for its tourist attractions such as the Burj Khalifa which is the world's tallest building.