WThe Huai Kha Khaeng Wildlife Sanctuary is in Uthai Thani and Tak Provinces, Thailand. The park was established in 1974, and is part of the largest intact seasonal tropical forest complex in Mainland Southeast Asia. It, coupled with the Thungyai Naresuan Wildlife Sanctuary was declared a World Heritage Site by the United Nations in 1991. Together, the two sanctuaries occupy 622,200 hectares. As of 2014 it still contained viable populations of large mammals, including gibbons, bears, elephants and Indochinese tigers, although like all other sites in mainland Southeast Asia, some species have disappeared or have experienced severe declines.
WKhlong Wang Chao National Park is a national park in Thailand.
WKhun Phawo National Park is a national park in the Mae Ramat District, Tak Province, Thailand.
WLan Sang National Park is in the Dawna Range, Tak Province, northern Thailand. Established in 1979, it is an IUCN Category II protected area measuring 104 square kilometres (40 sq mi). On the Tak-Mae Sot Highway in Mueang Tak District, it became the country's 15th national park.
WMae Ping National Park (อุทยานแห่งชาติแม่ปิง) is at the southern end of the Thanon Thong Chai Range, in Lamphun, Tak, and Chiang Mai Provinces in northern Thailand. Established in 1981, it is an IUCN Category II protected area measuring 1,003.75 square kilometres (387.55 sq mi). The park's main features are the Ping River, Koh Luang Waterfall, and Thung Kik-Thung Nangu meadows.
WMae Wa National Park is a national park in Thailand's Lampang and Tak provinces. This mountainous park features scenic mountain viewpoints, waterfalls and caves.
WNamtok Pha Charoen National Park is a national park in the Phop Phra District, Tak Province, Thailand. Most of its area is high complex mountains of 1,765 m elevation and features a mixed deciduous forest and a coniferous forest.
WThe Phi Pan Nam Range, also Pee Pan Nam, is a 400 km (249 mi) long system of mountain ranges in the eastern half of the Thai highlands. It is mostly in Thailand, although a small section in the northeast is within Sainyabuli and Bokeo Provinces, Laos.
WThe Ping River, along with the Nan River, is one of the two main tributaries of the Chao Phraya River. It originates at Doi Thuai in the Daen Lao Range, in Chiang Dao district, Chiang Mai Province. After passing Chiang Mai, it flows through the provinces of Lamphun, Tak, and Kamphaeng Phet. At the confluence with the Nan River at Nakhon Sawan, it forms the Chao Phraya River.
WTaksin Maharat National Park is a national park in Tak Province, Thailand. Home to Thailand's largest tree, the park also features waterfalls, caves, and rock formations.
WThe Thi Lo Su Waterfall is claimed to be the largest and highest waterfall in Thailand. It stands 250 metres (820 ft) high and nearly 450 metres (1,480 ft) wide on the Mae Klong River, flowing down from Huai Klotho into the Umphang Wildlife Sanctuary in Tak Province in northwestern Thailand.
WThe Thung Yai Naresuan Wildlife Sanctuary is a protected area in Thailand in the northern part of Kanchanaburi Province and the southern part of Tak Province. It was declared a wildlife sanctuary in 1972, and a World Heritage Site by UNESCO in 1991 together with the adjoining Huai Kha Khaeng Wildlife Sanctuary.
WThe Wang River is a river in northern Thailand.