The general topography consists of steep mountains due to the elevation of the earth's crust. The base rock is an igneous rock, Jurassic granite, approximately 135 - 180 million years old. On the eastern side, it's very steep, with the ridgeline running from northwest to southeast. The southeastern foothills are gently sloping, with Khao Phra Bat, at approximately 1,085 meters above mean sea level, being the highest peak. There is a small plain in the west. On Khao Phra Bat, large and round stones are scattered everywhere, and a massive stone with Buddha's footprint is visible from the ground outside the national park. The high mountains of Khao Khitchakut National Park serve as the headwaters for several significant creeks, including Khlong Krathing, Khlong Takhian, Khlong Thung Ple, and Khlong Phluang, all of which are vital water sources for Chanthaburi River.

         Khao Khitchakut National Park climate is influenced
by the northeast and southwest monsoons. From mid-October to mid-February, the weather is cold, and the sky is clear. Between mid-May and mid-October, high humidity, cloudiness, and heavy rain prevail. The annual average rainfall is 2,900 millimeters. The summer months of February - April are when the climate is influenced by the northeast wind changing to the southwest monsoon. The average temperature for the year is 27 degrees Celsius.

Flora and Wildlife
         Khao Khitchakut National Park ecosystem can be divided into two main types: the tropical rain forest and the hill evergreen forest. The tropical rain forest encompasses the majority of the national park. Plants that are found in the area include Dipterocarpus turbinatus C.F.Gaertn, Mesawa, Archidendron quocense (Pierre) I. C. Nielsen, Lithocarpus ceriferus, Indian Rose Chestnut, Negkassar, Diospyros apiculata Hiern., Burmese Grape., Barringtonia angusta Kurz, Madhuca pierrei, Acalypha spiciflora Burm.f, Knema furfuracea (Hook. f. & Thomson) Warb, Malva Nut, and Hopea helferi (Dyer) Brandis. The hill evergreen forest is higher than 800 meters above sea level, which is found only at the mountain peaks such as Khao Phra Bat Phluang. The plant species found are Lithocarpus ceriferus, Hopea helferi (Dyer) Brandis, Negkassar, Indian Rose Chestnut, Litsea petiolata Hook.f, Agastache rugosa (Fisch et. Mey) O.ktze, Memecylon ovatum Sm, Mugwort, Gamboge tree, Persimmon, Cinnamon, and Acalypha spiciflora Burm. f.

          Wildlife is abundant because of the steep mountain terrain. Moreover, people who live near the national park do not poach since they already have a primary career with a good income from the orchards. Wild animals, such as Elephant, Bull, Fishing Cat, Asian Black Bear, Sambar Deer, Barking Deer, Serow, Sild Boar, Pileated Gibbon, East Asian Porcupine, Asian Palm Civet, Small Asian Mongoose, Burmese hare, Tupaia glis, Variable Squirrel, Lyle's Flying Fox, Chinese Francolin, Lewis' Silver Pheasant, Red JungleFowl, White-Breasted Waterhen, Thick-billed Green Pigeon, Greater Coucal, Indian Roller, Great Hornbill, White-Rumped Shama, Black-Crested Bulbul, Black-Drongo, Olive-Backed Sunbird, Yellow Tortoise, Common House Gecko, Tokay Gecko, Oriental Garden Lizard, Butterfly Lizard, Monitor Lizard, many-striped Skink,
        Burmese python, White-lipped Tree Viper, Asian Common Toad, Green Paddy Frog, Common Tree Frog, Asian painted Frog. The kinds of fish that can be found along creeks and streams are Swamp Barb, Red-tailed Rasbora, Hard-lipped Barb, Silver Sillago, Freshwater Batfish, Yellow Mystus, Ponyfish, Climbing Perch, Goby Fish, Zig-Zag Eel, Black-spot Long Tom.