Wiang Kosai National Park

Wiang Ko Sai National Park
อุทยานแห่งชาติเวียงโกศัย
Columnar basalt formations in park
Location within Thailand
LocationLampang and Phrae Provinces
Coordinates17°56′N 99°33′E / 17.93°N 99.55°E / 17.93; 99.55
Area410 km2 (160 sq mi)
Established1981
Visitors22,060 (in 2019)
Governing bodyDepartment of National Park, Wildlife and Plant Conservation

Wiang Ko Sai National Park (Thai: อุทยานแห่งชาติเวียงโกศัย) is a national park in Northern Thailand. It covers parts of the Wang Chin District of Phrae Province and Mae Tha, Thoen and Sop Prap Districts of Lampang Province.