Wiang Kosai National Park, with an area of 256,115 rai ~ is located in one of the mountain chains of the
Phi Pan Nam Range, with the highest peak,
Doi Mae Tom, reaching 1,267 m. The sources of many rivers, such as Mae Koeng, Mae Chok, Mae Sin and Mae Pak, are in these mountains. The park has two famous
waterfalls,
Mae Koeng Luang and Mae Koeng Noi, as well as the Mae Chok
hot spring. ==Flora and fauna==