Located in the west of Thai Gulf, in the territory of Kuiburi District, Sam Roi Yot Sub District, Prachuap Khiri Khan Province. Khao Sam Roi Yot National Park is Thailand’s first coastal National Park in 1996, covering the area of approximately 98.8 square kilometers. The landscape is high steep limestone mountains by the beautiful coast, matching with plain area stand by the sea, which are marshy beach and shallow sea pond. There are limestones islands nearby the coast e.g., Ko Sattakut, Ko Kho Ram, Ko Nom Sao, Ko Rawing, Ko Rawang and Ko Khi Nok. The flat area with stagnant water through the year on the west of the park is Thung Sam Roi Yot, which is the large freshwater marsh, covering around 36.8 square kilometers.

Topography
The geological characteristic here is very high steep limestone that becomes the high steep cliffs as well as the deep abyss. The highest peak of the hills is 605 meters above the mean sea level. The most fascinating are Khao Yai, Khao Tham Prathun, Khao Daeng, Khao Khan Ban Dai and etc. The limestone land had been worn away by natural impact till became caves or abyss such as Tam Kaeo, Tam Sai, Tam Phraya Nakhon Cave and etc.

Flora and Fauna
Khao Sam Roi Yot has a variety of ecology system, composing of sea, beaches, mangrove forests, freshwater, marsh land, and limestone mountain, which make the areas are appropriated to be living place of any kind of animals, particularly birds. Plant community found are beach forests, mangrove forests, limestone-hill forests and hydropholic plant social. General plants found in the park are Casuaria equisetifolia (Sea oak), Theapesia populnea, Calophyllum inophyllum, Manilkara hexandra, Diospyros mollis (Ebony tree), Wrightia tomentosa (Ivory), Dracaena loureiri, Diospyros bejaudii, Afzelia xylocarpa, Rhizophora mucronata (Red mangrone), Rhizophora apiculata, Ceriops decandra, Xylocarpus granatum, Avicennia marina; whereas social plants found in fresh pond are Cyperus spp., Neyraudia reynaudiana, Arundo donax, Themeda arundinacea, Hymenachne pseudointerrupta, Leersia hexandra, Nymphaea spp., Marsilea creuata (Water clover) Alocasia sp., Water chestnuts and etc.