Bangkok is a popular tourist place with 12 million people. The Bangkok extends for more than 32 kilometers (20 miles) in all directions. It is situated in the center of Thailand, on the Chao Phraya River near the Gulf of Thailand. Bangkok is administrative, economic, and cultural center of Thailand as well as it is the major commercial and transportation hub for South-east Asia. The Hualamphong Railway Station on Rama IV Road is the city's main rail station, serving most long-distance routes. The Bangkok Noi, across the river from the Grand Palace, is used for shorter trips outside of the city. Buddhism is considered the country's official religion, and Bangkok is Thailand's Buddhist center, home to many of the country's most famous temples, called wats. Buddhism is also the city's largest religion, with close to 95 percent of all citizens being Buddhist. Four percent of Bangkok's population is Muslim while Christians, Hindus, Confucians, and Sikhs account for less than one percent.