Khao Laem Ya–Mu Ko Samet is a Thai marine national park in the Gulf of Thailand off the coastline of Rayong, approximately 180 km southeast of Bangkok.

Rayong is a city on the east coast of the Gulf of Thailand and the capital of Rayong province. It covers tambons Tha Pradu and Pak Nam and parts of tambons Choeng Noen and Noen Phra, all within Mueang