The national park, with an area of 247,957 rai ~ 397 square kilometres (153 sq mi)[2] consists of mountains of 350–905 metres elevation. The park is the source of many streams, including Huai Mae La-mao, Huai Mae Charao, Huai Phrawo, Huai Mae Kasa, Huai Mae Kit Luang, Huai Pha-so, Huai Sa-muen Luang, Huai Samae, and Huai Mae Ra-mat, which flow into the agricultural areas of Mae Sot District and Mae Ramat DistrictinTak Province.[3]
The park was originally called "Mae Kasa National Park" and was later changed into "Khun Phra Wo National Park" in honour of Phra Wo, a Karen soldier in the Thonburi period. He was appointed as the head of La Mao customs house to defend his nation's independence till his death on the battlefield which was in the area of Khun Phra Wo National Park.[1]
It is cool and breezy throughout the year at an average temperature of 21 °C. The average highest temperature is 20 °C. The lowest temperature is 8 °C. The average rainfall is 1,676 mm per year.[3]
Namtok Khun Phawo (น้ำตกขุนพะวอ) A large waterfall around 100 m high and an origin of Huai Mae Charao (Mae Charao Creek).
Huai Mae Lamao (ห้วยแม่ละเมา) This large creek is in an unspoiled forest, offering whitewater rafting on rubber dinghies.
Nature Trail (เส้นทางเดินศึกษาธรรมชาติ) The walking path goes up and down the fairly steep hills, and passes along the river upstream and a small waterfall. During the period of change from the rainy to cool season, colourful wild flowers can be seen. The greenery is dotted with strikingly red Krathue (Boesenbergia prainiana) and yellow Mexican sunflowers.
Namtok Pha Thewa (น้ำตกผาเทวะ) It is on the nature trail and the most remarkable waterfall of the park. With a height of 150 m, the powerful flow falls against boulders and the pool below. In the woods, there is a pagoda containing cremated bones of a heartbroken woman who hung herself.
Tham Mae Usu (ถ้ำแม่อุสุ) This cave is around 12 km from the Tha Song Yang District Office to the north. To the west, there is a gigantic hollow rock. In the afternoon, rays of sunlight illuminate the cave.
Namtok Thung Nang Khruan (น้ำตกทุ่งนางครวญ) A medium-size waterfall with small layers of flowing water amid a shady forest. It receives water from a canal beside rice fields.
