Thamphathai National Park covers the areas of Muang District, Jae Hom District, Ngao District of Lampang Province. The topography of the National Park consist of high mountains, abundant timber forests and mixed deciduous forests, as well as teak plantations spreading all over the areas. The National Park is the dwelling place for a large number of wild animals. Most of the areas are water sources. Major tourist attractions include Thamphathai, Lom Phukeaw, Kewlom Reservoir, Tham-okroo, Huay Maepreung. Moreover, there are many small-sized waterfalls all over the National Park, as well as the Young Elephant Training Center, a tourist attraction of the Forest Industry Organization, situated in the approximate area of 1,284.9 square kilometers or 802,436.17 rai.
The topography of the National Park consist of high mountains, mixed forests, teak plantations and reclaimed areas. Major mountaintops include Doi Kewlom (1,202 meters high), followed by Doi Sanklang (1,022 meters high), Doi Phahuad (975 meters high). Most of the areas are timber forests and mixed forests. Doi Luang (1,100 meters high) is situated in the southern part of the National Park. Major agricultural sites are situated in the eastern part of the National Park, meanwhile, in the western part of the National Park, most of the areas are timber forests. Gullies and streams in the western part of the National Park flow into Wang River, meanwhile, most of the gullies and streams in the eastern part of the National Park flow into Ngao River.
It is extremely hot in summer (March-May) and the wind blows from the southwest. In the rainy season (May-October), meanwhile, it rains consistently and sometimes there are heavy storms and the wind blows from the southwest. In winter (November-February), it is extremely cold in the nighttime and the area is generally covered with fogs in the morning. The cold wind blows from the northeast.
Since the topography of the National Park consist of high mountains, there are various kinds of forests within the area of the National Park, including dense or leafy forests and arid, evergreen forests. Major plants include Malabar ironwood, rubber trees, Lithocarpus cantleyanus (Kor), Indian mahogany, Cinnamon, Gonocaryum lobbianum, etc. Leafy forests include mixed deciduous forests, timber forests. And major plants found in the forests include Leguminosae (Pradoo), Afzelia xylocarpa Roxb (Maka Mong), Xyliaxylocarpa (redwood plants), Lannea coromandelica (Oay Chang), Dalbergia oliveri Gamble (Ching Chan), different kinds of bamboo, Mitragyna diversi Folia (Toom Gwow), Hymenodictyon excelsum (U-lok), Combretum quadrangulare (Sa-gae), Bermuda grass, etc.
Wild animals found in the National Park include gaur, wild boars, monkeys, porcupines, moles, masked palm civets, bamboo rats, wild rabbits, different kinds of birds, reptiles such as ground lizards, chameleons, wild geckos, different kinds of snakes, and amphibians such as frogs, small green frogs, bullfrogs, toads, and different kinds of fish.