Dubai is the most populous city in the United Arab Emirates (UAE). It is located on the southeast coast of the Persian Gulf and is the capital of the Emirate of Dubai, one of the seven emirates that make up the country. Dubai has emerged as a global city and business hub of the Middle East. It is also a major transport hub for passengers and cargo. Dubai was the 22nd most expensive city in the world and the most expensive city in the Middle East. In 2014, Dubai's hotel rooms were rated as the second most expensive in the world, after Geneva. Dubai was rated as one of the best places to live in the Middle East by U.S. global consulting firm Mercer.