While the eastern part of the province is characterized by relatively flat river plains, the northern and western part consist of the hilly terrain of the Thai highlands with the Khun Tan Range and the Phi Pan Nam Range in the west and the Daen Lao Range in the north. While not the highest elevation of the province, the high Doi Tung (Flag Hill) is the most important terrain feature. Wat Phra That Doi Chom Thong wat on top of the hill, according to the chronicles, dates back to the year 911. Nearby is Doi Tung Royal Villa, former residence of the late princess mother (mother of the present king) Somdej Phra Srinagarindra. Thanks to her activities the hills were reforested, and the hill tribes diverted from growing opium poppies to other crops including coffee, bananas, coconuts, and pineapples.