Qatar occupies 11,437 km2 (4,416 sq mi) on a peninsula that extends approximately 160 km (99 mi) north into the Persian Gulf from the Arabian Peninsula. The population of Qatar is 2.24 million as of 2015. Qatar cities mainly include Doha, Al Khor, Al Wakrah, Al Khuwayr, Ar Ru'ays, Ar Rayyan, Ras Laffan, Dukhan, Umm Sa'id, Umm Salal 'Ali, Umm Bab, and Umm Salal Muhammad. Doha is the capital among the Qatar cities while Al Wakrah is the second most important city. Studies show that more than 90 percent of the urban population lives in Doha among all other Qatar cities. Doha is the capital city and most populous city of the State of Qatar. Doha has a population of 1,351,000 in a city proper with the population close to 1.5 million. The city is located on the coast of the Persian Gulf in the east of the country. It is Qatar's fastest growing city, with over 50% of the nation's population living in Doha