Several Rock Art sites were discovered and partially studied in southern Thailand, especially in Phang Nga Bay. Fewer are known further south, in the coastal area along the Lanta Bay and in the Trang and Satun provinces. This presentation provides preliminary results of surveys conducted in 2021 on caves located in the coastal zone and offshore in the Lanta Bay as part of the Thai-French Archaeological Mission that focuses on the maritime landscape and exchange networks. The project is done in collaboration with local groups in Ko Lanta, amongst which are the indigenous maritime people called “Urak Lawoi.” This participatory approach shed new light on the potential rock art traditions this region possesses, and on the relationship the Ko Lanta have with landscape and rock Art. The rock art may correspond to landmarks for navigation, especially along exchange routes linking the bay to Trang, Satun and Malaysia, and/or form part of rituals undertaken during successive sequences of use by various local and foreign groups. This project also focuses on the special relationship local groups, and especially the Urak Lawoi, developed with hills and caves, in particular, on islands.