The Khun Than mountain range of the Doi Khun Than National Park forms a natural boundary between Lamphun and Lampang provinces. The northern rail line to Chiang Mai runs through the longest rail tunnel in the country, which is 1352 metres long and takes five minutes to traverse. The mountain has both virgin jungle and pinery.
Many tourists choose to walk from the Khun Than Station up the mountain a distance of about 7 kilometres. There are four rest areas on the way. Visitors may also camp overnight but must provides for their own food. The best time to take the trip is between November and February when the weather is fine and cool.