Namtok Phlio National Park area is primarily mountainous and complex high mountain ranges. It is in the range of 20 - 924 meters above sea level, gradually sloping down to the south, with narrow plain areas surrounding the mountainside. The site is on a steep slope. Khao Map Wa Krok Summit, at approximately 924 meters above sea level, is the highest point. The geological characteristics of the rocks are mostly igneous rocks of the granite type. In the middle of the area, terrain is steep complex mountains. It comprises pristine evergreen forests, which make this area a headwater of many small creeks with water flowing all year round, such as Khlong Narai, Khlong Phlio, Khlong Trok Nong, Khlong Makok, Khlong Suan, Khlong Khlung, scattered around. The central area is a steep ridge.

        Namtok Phlio National Park is located in Chanthaburi Province, which is in the eastern part of Thailand. It is under the influence of monsoons, seasonal wind circulation system. The northeast monsoon is characterized by wind from the northeast, which originates in China. The duration is from November until February, causing a winter which is not very cold. The average temperature throughout the year is 26.8 degrees Celsius. The highest average temperature is 31.6 degrees Celsius, and the lowest average temperature is 23.2 degrees Celsius.

          Another monsoon from the southeast blowing from the ocean brings moisture and water vapor from the sea causing rainy season. The air is humid and it rains quite often. The annual rainfall averages more than 2,000 millimeters. From March to April, it's the summer which is sweltering before the monsoon transition and the next rainy season begins in May.

Flora and Wildlife
         1. It is an tropical rain forest area that has a biodiversity of plant species with an average annual rainfall of more than 2,000 millimeters (the highest temperature is more than 30 degrees Celsius). The tropical rain forest of Namtok Phlio National Park houses a collection of various types of plants, which can be divided according to the canopy layer as follows.
*The upper canopy is the crown of the forest, enclosing the top layer. The trees are tall and large, covering roughly 60% of the area. The predominant plants include Malva Nut (Scaphium macropod), Shozea henryana, Shorea hypochra Hance., Hopea ferrea, and Dipterocarpus turbinatus C.F.Gaertn.

*The second layer has much denser tree species than the upper one. The canopy cover is about 95 percent, while the upper is only 60 percent. The average height of the tree is about 19 meters, with more species diversity than that of the upper. Plant species found include Xerospermum Intermedium, Eagle Wood (Aquiloaria crassna), Helicia excelsa, long

(Archidendron quocense), Prunus arborea Var.montana, and Santol (Sandoricum indicum). In total, there are 28 types.

           In addition, epiphytic plant species are also found around the trunks and branches of the trees consisting of Staghorn Fern, Oak-Leaf fern (Drynaria quercifolia), bird's-nest Fern, Hoya diversifolia Blume, Dischidia imbricata (Blume) Steud, and Orchidaceae family, especially Dendrobium friedericksianum Rchb.f, with beautiful shapes and bright colors (native to Chanthaburi). Another group of plants that are prominently important in the evergreen forest is the vine families, such as Snake Plant, Virginia Creeper, Chinese Salacia (Salacia chinensis), and rattan plants.

*Understory is a layer that is less dense than the second layer, not higher than 5 meters. Typically, the plant species, of about 36 species, are seedlings and sprouts of the second-layer trees. Additionally, there are many kinds of undergrowth plants. The dense forest with multiple canopy layers contributes to soil covering, thereby reducing soil erosion, retaining moisture, and allowing water to be stored in the soil. Therefore, it has the potential to feed water into streams all year round.

          2. This area has a rich biodiversity of wildlife. Namtok Phlio National Park area has a very abundant rainforest condition, but it is a flat area surrounded by asphalt roads and local highways. Moreover, this forest is not connected to other conservation forests, resulting in a solitary ecosystem of animals. There are many critically endangered endemic birds, such as Lewis' Silver Pheasant, as well as animals that are unique to the tropical rainforest, such as Pileated Gibbon. Additionally, there is one preserved wild animal according to the Wildlife Preservation and Protection Act B.E. 2535, that is Serow.

           Mammals found include in 9 orders, 22 families, and 38 species, of which 12 species are protected wildlife. The most common animals are rodents in the Rodentia order, which contains eight species, followed by bats in the Chiroptera order, with seven species. The most abundant species are carnivores, or predators, in the Carnivora order, according to the study report, which are 11 species, but only four species are directly found. Only four species of herbivores, or even-toed ungulates, are found in the Artiodactyla order. Four species of lemurs the Primate order are found in the direct survey.

         In addition, mammals with a small number of species per family and order are found, including Pangolin (Pholidota order, Manidae family), Dwarf shrew (Insectivora order, Soricidae family), Northern treeshrew (Scandentia order, Tupaiidae family), and Sunda Colugo (Dermoptera order, Cynocephalida family).

          Birds are found in a total of 15 orders, 43 families, and 149 species. They are mostly protected species under the Wildlife Preservation and Protection Act B.E. 2535. Passerine is the dominant order, accounting for more than half of all birds; the remaining 50% is made up of approximately 70 species. The order Piciformes has the greatest diversity with 13 species, and the families of Kingfisher, Blue-tailed Bee-Eater, Hornbill, and Indian Roller have 13 species. The minor groups of birds include 13 species of the family of Columbidae, six species of Hawks, and nine species of Owls and Pheasants. Additionally, Herons, King Quails, Parrots, and Nightjars are seen with 2 species each. Ducks, Swallows, and Red-billed blue magpies are found in only one species each.

           Reptiles are found in 2 orders, 13 families, and 59 species. Snakes (Squamata order, Serpentes suborder) have the most diverse population, with 27 species divided into 25 families. The second highest number of reptiles is in the Squamata order, the Sauria suborder, with 25 species from 5 families, such as Lizards, Geckos, Skinks, the Monitor Lizard in the Varanidae family, and the Lacertidae family. The final reptile order is the Chelonia order, which contains seven species divided into three families and includes Tortoises, Freshwater Turtles, and Softshell Turtles.

          The amphibians discovered comprise a total of 19 species from one order, five families, and 15 genera, including Frogs, Common Tree Frogs, Chubby Frogs, Bullfrogs, Asian toads, and freshwater fish. In Namtok Phlio National Park, there are water sources with water flowing all year round, consisting of reservoirs, streams, and waterfall basins that are suitable for marine animals, especially a variety of fish species, including Jullien's Mud Carp, Siamese Rock Catfish, River Loaches, Lizardfish, Soro Brook Carp, Gouramis, Trichopsis, Dwarf Snakehead, and Zig-zag eel.