Traditional coastal communities possess marine knowledge that enable them to live with and live on resources in different eco-niches like intertidal strands, mangroves, mudflats, beach forest, and coral reefs. Chao Lay (which means Sea People in Thai language) or former sea nomads of Thailand are indigenous groups who used to make temporary settlement on islands and along the coastal areas. The sub-groups of Moken, Moklen and Urak Lawoi, total of 43 villages in southern Thailand, have intangible marine heritage that facilitate their wise uses of marine and forest areas for centuries. The Chao Lay are said to have the great ability in, “reading the water to remember the wind, and reading the sky to remember the star” (Kuain 2008). At present, marine knowledge and skills remain significant in some communities. The case in point is Rawai beach community in Phuket Province in southern Thailand, where two sub-groups of Chao Lay, the Urak Lawoi and the Moken have chosen this area as a settlement hundreds of years ago; not only because of the shallow water near the beach and the nearby coral reefs, but also because it is a bay that is sheltered from the winds from two directions. So the place is very suitable for both living and for foraging and fishing with abundant land and marine resources. The knowledge of settlement site selection is very crucial, and most of the Chao Lay villages on the islands and shore are located in the bay or beach protected from the wind and storm. Fresh water can be easily found nearby in the form of spring, stream, or pond.