Rayong is a province in the east of Thailand. It borders Chonburi and Chanthaburi. To the south of Rayong is the Gulf of Thailand.
Rayong is located about 180 km to the southeast of Bangkok.
There are about 15 islands in the Gulf of Thailand belong in Rayong province. The most popular amongst tourists are Koh Samet, Koh Mun and Koh Khod.