Nakai-Nam Theun National Park in Nakai District, Khammouane Province,

Laos Laos (, ''Lāo'' )), officially the Lao People's Democratic Republic ( Lao: ສາທາລະນະລັດ ປະຊາທິປະໄຕ ປະຊາຊົນລາວ, French: République démocratique populaire lao), is a socialist ...

, is one of the last remaining wildernesses in

Southeast Asia Southeast Asia, also spelled South East Asia and South-East Asia, and also known as Southeastern Asia, South-eastern Asia or SEA, is the geographical United Nations geoscheme for Asia#South-eastern Asia, south-eastern region of Asia, consistin ...

. Nakai-Nam Theun covers approximately 4,270 km² of the

Annamite Range The Annamite Range or the Annamese Mountains (french: Chaîne annamitique; lo, ພູ ຫລວງ ''Phou Luang''; vi, Dãy (núi) Trường Sơn) is a major mountain range of eastern Indochina, extending approximately through Laos, Vietnam, ...

and the adjacent Nakai Plateau in Khammouane and Bolikhamsai Provinces. It was designated a national park on 15 February 2019 by Prime Ministerial Decree No. 36, 15 February 2019. It is managed by the Ministry of Agriculture and Forestry (MAF). It is adjacent to the Vu Quang National Park of

Vietnam Vietnam or Viet Nam ( vi, Việt Nam, ), officially the Socialist Republic of Vietnam,., group="n" is a country in Southeast Asia, at the eastern edge of mainland Southeast Asia, with an area of and population of 96 million, making i ...

Rivers

From north to south, riversheds in the park consist the following rivers: *Nam Kata (eastern part only; the Nam Houay, on which the town of Na Kadok is located, is a tributary) *Nam Xot *Nam Mon *Nam Theun *Nam Noy *Nam Pheo (a tributary of the Nam Noy) *Nam One All are tributaries of the

Nam Theun Nam Theun (also known as ''Khading''), is a river in Laos, in Khammouane Province, Khammouane and Bolikhamsai Provinces. Together with its tributaries Nam One, Nam Noy, and Nam Theun it has total length of and drains an area of . "Nam Theun" is ...

to the southwest in the Nakai Plateau.

Habitat

A series of surveys conducted since 1994 by the co-operative programme of the

Wildlife Conservation Society The Wildlife Conservation Society (WCS) is a non-governmental organization headquartered at the Bronx Zoo in New York City, that aims to conserve the world's largest wild places in 14 priority regions. Founded in 1895 as the New York Zoological ...

(WCS), the Lao Department of Forestry, and the

International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...

(IUCN) have revealed that the area has a high biodiversity value. Semi-evergreen forest, deciduous

dipterocarp Dipterocarpaceae is a family of 16 genera and about 695 known species of mainly tropical lowland rainforest trees. The family name, from the type genus ''Dipterocarpus'', is derived from Greek (''di'' = two, ''pteron'' = wing and ''karpos'' = fru ...

forest and stands of

pine A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accep ...

are all found on the Nakai Plateau and in the Annamite foothills to the east, grading into more exclusively

evergreen forest An evergreen forest is a forest made up of evergreen trees. They occur across a wide range of climatic zones, and include trees such as conifers and holly in cold climates, eucalyptus, Live oak, acacias, magnolia, and banksia in more temperate zone ...

s as the land rises towards the Vietnamese border. Higher still, huge areas of montane fagaceous forest cloak the slopes, interspersed with patches of

Fokienia hodginsii ''Fokienia'' is a genus of conifer tree belonging to the cypress family. In its characteristics, ''Fokienia'' is intermediate between the genera of ''Chamaecyparis'' and ''Calocedrus''. Genetically ''Fokienia'' is much closer to ''Chamaecyparis'' ...

, a commercially valuable cypress-like

conifer Conifers are a group of conifer cone, cone-bearing Spermatophyte, seed plants, a subset of gymnosperms. Scientifically, they make up the phylum, division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single ...

. Above c. 2,000 m the fagaceous forest gives way to more stunted,

rhododendron ''Rhododendron'' (; from Ancient Greek ''rhódon'' "rose" and ''déndron'' "tree") is a very large genus of about 1,024 species of woody plants in the heath family (Ericaceae). They can be either evergreen or deciduous. Most species are nati ...

-dominated ericaceous

cloudforest A cloud forest, also called a water forest, primas forest, or tropical montane cloud forest (TMCF), is a generally tropical or subtropical, evergreen, montane, moist forest characterized by a persistent, frequent or seasonal low-level cloud c ...

Flora

Species of plants listed as

threatened Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensat ...

by IUCN include conifer ''

Cephalotaxus mannii ''Cephalotaxus mannii'' is a species of plant in the family Taxaceae. It is a tree up to about tall, native to southern China, northeast India, Laos, northern Thailand, northern Myanmar and northern Vietnam Northern Vietnam ( vi, Bắc Bộ ...

''. The only known population of

Vietnamese White Pine ''Pinus dalatensis'', also known as Vietnamese white pine or Dalat pine, is a species of pine endemic to Indochina. In Vietnam it grows in the mountains of the central and south-central parts of the country at elevations of .Businský, R. (1999). ...

in Laos is in Nakai-Nam Theun.

Fauna

Mammals

Species of mammals, some discovered relatively recently, include the following: *

Saola The saola (''Pseudoryx nghetinhensis''), also called spindlehorn, Asian unicorn, or infrequently, Vu Quang bovid, is one of the world's rarest large mammals, a forest-dwelling bovine native to the Annamite Range in Vietnam and Laos. It was descr ...

Giant muntjac The giant muntjac (''Muntiacus vuquangensis''), sometimes referred to as the large-antlered muntjac, is a species of muntjac deer. It is the largest muntjac species and was discovered in 1994 in Vũ Quang, Hà Tĩnh Province of Vietnam and in cen ...

Roosevelt's muntjac A single specimen of the Roosevelt's muntjac or Roosevelt's barking deer (''Muntiacus rooseveltorum'') was presented to the Field Museum in 1929 following the Kelley-Roosevelts expedition organized by Theodore (Jnr) and Kermit Roosevelt. The ...

Truong Son muntjac The Truong Son muntjac or Annamite muntjac (''Muntiacus truongsonensis'') is a species of muntjac deer. It is one of the smallest muntjac species, at about , half the size of the Indian muntjac (or common muntjac). It was discovered in the Truon ...

Indo-chinese warty pig The wild boar (''Sus scrofa''), also known as the wild swine, common wild pig, Eurasian wild pig, or simply wild pig, is a suid native to much of Eurasia and North Africa, and has been introduced to the Americas and Oceania. The species is n ...

Heude's pig The wild boar (''Sus scrofa''), also known as the wild swine, common wild pig, Eurasian wild pig, or simply wild pig, is a suid native to much of Eurasia and North Africa, and has been introduced to the Americas and Oceania. The species is n ...

Annamite striped rabbit The Annamite striped rabbit (''Nesolagus timminsi'') is a species of rabbit native to the Annamite mountain range on the Laos-Vietnam border. The rabbit is striped, with a red rump, and resembles the Sumatran striped rabbit. It only recently beca ...

Javan rhinoceros The Javan rhinoceros (''Rhinoceros sondaicus''), also known as the Javan rhino, Sunda rhinoceros or lesser one-horned rhinoceros, is a very rare member of the family Rhinocerotidae and one of five extant rhinoceroses. It belongs to the same ge ...

(''Rhinoceros sondaicus annamiticus'') *

Indochinese tiger The Indochinese tiger is a population of the ''Panthera tigris tigris'' subspecies that is native to Southeast Asia. This population occurs in Myanmar, Thailand, and Laos. In 2011, the population was thought to comprise 342 individuals, including ...

Asian elephant The Asian elephant (''Elephas maximus''), also known as the Asiatic elephant, is the only living species of the genus ''Elephas'' and is distributed throughout the Indian subcontinent and Southeast Asia, from India in the west, Nepal in the no ...

Birds

More than 400 bird species have been identified in Nakai-Nam Theun and the adjacent northern extension. This is by far the highest avian species richness of any site yet surveyed in Laos and is the highest recorded in a single protected area in Southeast Asia.

Languages

Many endangered

Vietic languages The Vietic languages are a branch of the Austroasiatic language family, spoken by the Vietic peoples in Laos and Vietnam. The branch was once referred to by the terms ''Việt–Mường'', ''Annamese–Muong'', and ''Vietnamuong''; the term ''V ...

are spoken in the Nakai-Nam Theun area. The Vietic peoples are the indigenous peoples of the Nakai-Nam Theun area, and have deep knowledge of the local ecology. The

Saek language Saek (Sek; Thai: ภาษาแสก) is a Tai language spoken in at least ten villages in Khammouane Province, Laos, and at least four villages in Nakhon Phanom Province in northeastern Thailand, just across the Mekong River. It is spoken by ...

, which preserves many archaic phonological features not found in any other

Tai language The Tai or Zhuang–Tai languages ( th, ภาษาไท or , transliteration: or ) are a branch of the Kra–Dai language family. The Tai languages include the most widely spoken of the Tai–Kadai languages, including Standard Thai or Sia ...

, is also spoken in the area, often alongside Vietic languages in the same villages. Saek speakers had lived in the area for about 300 years, and had originally come from Vietnam. Bru speakers had moved to the area in the 1800s and 1900s, and now make up the majority of the population. Lao and Vietnamese speakers, most of whom are recent migrants, are also found in the vicinity.

References

{{DEFAULTSORT:Nakai-Nam Theun National Park Geography of Khammouane province Geography of Bolikhamsai province