Wiang Kosai is the first national park in Prae Province. It covers Long District and Wang Chin District, Prae Province and Tern District, Sobprab District and Mae Ta District, Lampang Province. There are crossed over by high steep mountains and many beautiful waterfalls, e.g. Mae Koeng Luang, Mae Koeng Noi, and also Mae Jork Hot Spring which is the source of rivers and streams. The area of the park is about 410 Km2 (256,250 Rai).
The landscape is high steep mountains, the average steep is 80 degree. The highest point from sea level equals 1,267 meters whereas the average equal 800 meters. Covering with evergreen forest and mixed deciduous forests and overlapping high steep cliffs that are the sources of many streams e.g. Mae Koeng, Mae Jork, Mae Sin and Mae Pak. Since mountain is sandstone, it makes the soil decayed from the mountain become sandy soil with fine ventilation. The plain area nearby the slopes of the hill is good condition laterite soil.
Dong Ta Kien
Mae Jork Hot Spring
Mae Koeng Luang and Mae Koeng Noi Waterfalls
Mae Sin Waterfall
Pan Jen Waterfall
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