Rayong (Thai: ระยอง, pronounced [ra.jɔːŋ]) is a city (thesaban nakhon) on the east coast of the Gulf of Thailand. It is the capital of Rayong Province, and covers the tambon Tha Pradu and Pak Nam and parts of tambon Choeng Noen and Noen Phra, all within Mueang Rayong district. As of 2005 the population was 54,641. The main industry is fishing, and it is the main producer of Thailand's fish sauce. It is also the center of the chemical and auto industries.