Bangkok, city, capital, and chief port of Thailand. It is the only cosmopolitan city in a country of small towns and villages and is Thailand’s cultural and commercial centre. Bangkok is located on the delta of the Chao Phraya River, about 40 km from the Gulf of Thailand. It was formerly divided into two municipalities—Krung Thep on the east bank and Thon Buri on the west—connected by several bridges. In 1971 the two were united as a city-province with a single municipal government.