Topography
Doi Phuka national park, in Nan province, was designated on 17 June 2000. The park is named after the tallest peak in the park boundaries, Doi Phuka, which sits at 1980 meters (6140 feet) above sea level. It is the northern Thailand's largest national park covering 1,704 square kilometers.
Since the landscape was created under the ocean there are abundance of limestones. Consequently there are limestone caves, waterfalls, and fossils. Rainy season is from May to October, with the peak rainfall in August and September. The cold season (November - February) is the popular season for the visitors.
There are 3 main different forest types. Mixed Decidous forest, Dipterocarp with Oak forest and hill evergreen forest. There is a rare plant called Chompoo Phuka Tree in the park. This tree flowers in the month of February and fruits in the month of May. The flower, white rose in color, bloom in long upright racemes.