The national park covers an area of 999 square kilometres (386 sq mi) and was established in 1998, it is home to rugged mountains and the reservoir of the Sirikit Dam.

[4] Lam Nam Nan National Park is located about 50 kilometres (30 mi) north of Uttaradit town in the Mueang district of Phrae Province and the Tha Pla and Nam Pat districts of Uttaradit Province.

[6] The Sirikit Dam, impounding the Nan River, forms a large reservoir in the park.

Lam Nam Nan was declared a national park, which was announced in the Government Gazette, volume 115, part.

[2] Since 2002 this national park has been managed by Protected Areas Regional Office 11 (Phitsanulok) The Sirikit Dam reservoir is a popular boating recreation spot and features a number of small islands and reefs.