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Doi Khun Tan National Park (Thai: อุทยานแห่งชาติดอยขุนตาล) straddles the mountainous area of the Khun Tan Range in Lamphun and Lampang Provinces, northern Thailand. Established in 1975 as Thailand's tenth national park, it is an IUCN Category V protected area measuring 159,556 rai ~ 255 square kilom
etres (98 sq mi). The park ranges in elevation from 325–1,373 m. Its best known feature is Thailand's longest railroad tunnel, 1,352 m long.
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