Khao Laem Ya - Mu Ko Samet National Park is classified as a coastal national park mixed with oceanic islands. It is located on the eastern coast of the Gulf of Thailand. The sea area is about 123 square kilometers, or 94 percent of the total area. The terrain consists of granite mountains, consisting of Khao Plet and Khao Laem Ya, with a height of 108 meters above sea level, and a long stretch of sandy beaches and shallow seas, known as Hat Mae Ramphueng Beach, which is approximately 12 kilometers long. Ko Samet is characterized by mountains and low hills, including Khao Krachom, Khao Phloi Waen, and Khao Phra Chedi The western side of the island has a significantly steeper slope than the eastern side. The east has a slight slope and there is a continuous, long sandy beach along the eastern side. The North is about 2,500 meters wide, with a length to the end of the island of about 6,500 meters. The central part of the island is not very high, and there is a plain on the shore where the villagers' houses are primarily located on the north and eastern sides. At the southern tip of the cape, there are three smaller islands nearby, consisting of Ko Chan, Ko San Chalam, and Ko Hin Khao. Additionally, eight islands are located near the coast, including Ko Plaitin, Ko Klet Chalam, Ko Makham, Ko Kruai, Ko Kudi, Ko Thai Khangkhao, Ko Talu, and Ko Yung Kluea. 

        Khao Laem Ya National Park - Mu Ko Samet has an average annual rainfall of about 1,500 millimeters. The monsoon season is between May and September, and it has extremely strong winds, so sometimes traveling is prohibited. In one month, there will be strong waves and winds for about 15 days on average. Between December and March, there may be monsoon winds and heavy rain that make traveling by sea impractical. The average temperature is 29 degrees Celsius. The hottest season lasts from March to June, while the coldest season lasts from November to January.

      Flora and wildlife The distribution characteristics of plant species in Khao Laem Ya - Mu Ko Samet National Park vary according to the topography, which can be classified into : Dry evergreen forest is primarily found in the national park, both on the mainland such as such as On the mountains of Khao Laem Ya, Khao Plet, and Khao Tian, and on the islands. The forest condition is relatively sparse, with large trees not found due to destruction and cutting. The plant species found include Atalantia monophylla DC., Cleistanthus gracilis, Memecylon myrsinoides Blume, Velvet tamarind, Tomentose Wrightia, Ptercarpus macrocarpus Kurz., Common Fig (Ficus carica), Adenanthera pavonina, Lagerstroemia duperreana Pierre ex Gagnep., Lai, Vitex peduncularis Wall. ex Schauer, Terminalia triptera Stapf, Horseradish tree, Drumstick, Antidesma puncticulatum Miq., Artocarpus lacucha, Black plum, Indochinese Tanoak, Ixora cibdela Craib, Caryota urens, Bamboo, and Phalaenopsis cornu-cervi (Breda) Blume & Rchb.f.
        Beach forest covers the coastal areas where the land is sandy and the sea cannot reach , or the rocky area along the coast. The soil is quite saline, combined with the salty air from the sea. Plants generally found are bushy trees whose trunks are very crooked, and branching. Branches are short and leaves are thick, and stiff. Plant species include Thespesia populnea (L.) Sol. ex Corrê, Siamese rough bush, Xylocarpus moluccensis (Lam.) M. Roem., Terminalia catappa, Casuarina equisetifolia, Seashore screwpine, and Goat's foot creeper. 

         From a survey of wildlife diversity in Khao Laem Ya - Mu Ko Samet National Park, it was found that there are at least 144 species of vertebrate animals, including Lesser Mouse-Deer, Masked Palm Civet, Crab-eating Macaques, Finlayson's Squirrels, Berdmore's Ground Squirrel, Northern Treeshrew, Lyle's flying fox, Pacific Reef Heron, Accipiters, Asian Palm Swift, Barn Swallow, Black Drongo, Crow-billed Drongo, Common Myna, The Indo-Chinese Rat Snake, Colubrid Snake, Monitor Lizard, Butterfly Lizard, Orange-winged Flying Lizard, Common House Gecko, Speckled Forest Skink, Tokay Gecko, Asian Common Toad, Asian Bullfrog, Common Tree Frog, Banded Bullfrog .

          For aquatic resources, coral reefs are found around Ko Samet, the Ko Kudi area, and Ko Talu. Highly fertile corals are at Khanna Rock, Ao Phai Rock, Ao Chek, Ao Kio Na Nai, Ko Chan, Ko Plaitin, Ko Kudi, and Ko Talu. Diverse marine species found include Staghorn Corals, Shrub Corals, Rock Corals, Brain Corals, Mushrooms Corals, Soft Corals, Sun Corals, Barrel sponge, Black Sea Urchins, Sea Cucumbers, Green Turtles, Sea Anemones, Clownfish, Eight-striped Butterflyfish, Pennant Coralfish, Blue-ring Angelfish, Parrotfish, Wrasse, Ray-finned Fish, Yellowback fusilier, Serranidae, Selar, Shark catfish, Mable Goby, Stolephorus, Sillago, Giant Clams, Nile Top Shell, Serpent's-head Cowry, Cone Shell, Clams, Muricidae, Ghost Crabs, and Brown Crabs.