Rayong is a city (thesaban nakhon) located on the shore of the Gulf of Thailand, in the east coast region 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. Main industry is fishing, and it is the main producer of Thailand's fish sauce. It is also a center for the chemicals and auto industries.