The Dangrek Mountains (Khmer regular script: Dangrek.png, Chuor Phnom
Dângrêk; Thai: ทิวเขาพนมดงรัก, Thiu Khao Phanom Dongrak; Lao: Sayphou Damlek), meaning "Carrying-Pole Mountains" in
Khmer, is a mountain range forming a natural border between Cambodia and Thailand.
The Dangrek are a relatively low mountain system, their average elevation being around 500 m. The
highest summits are Phalan Sun (670 m), Phanom Ai Nak (638 m), and a 753 m high place at the eastern end, in the
Chong Bok area, where the borders of Thailand, Laos and Cambodia intersect.
The mountain range extends in an east to west direction, forming the southern edge of the Khorat
Plateau. They stretch for 320 Km from the Mekong River until they merge with
the highlands of the Sankambeng, the southern arm of the Dong Phaya Yen Mountains in Thailand.
The northern side of the Dângrêk Mountains is gently sloping, while the sides facing southward
are usually a steep escarpment that dominates the plain of northern Cambodia. The watershed along the escarpment in
general terms marks the boundary between Thailand and Cambodia however there are exceptions. The main road
connecting the two countries in this area cuts through a pass in the Dangrek Mountains at O Smach.
The Preah Vihear Temple area, located on the shoulder of one of the
The mountains are mainly formed of massive sandstone with slate and silt. A few characteristic
basalt hills, like Dong Chan Yai (293 m) and Dong Chan Noi (290 m) are located on the northern side of the mountain
chain in the Ubon Ratchathani Province.
The Dângrêk Mountain range is mostly covered by dry evergreen forest, mixed dipterocarp forest,
and deciduous dipterocarp forest. Tree species like Pterocarpus macrocarpus, Shorea siamensis and Xylia xylocarpa
var. kerrii dominate. There has been much illegal logging both on the Thai as well as on the Cambodian side,
leaving large hill stretches denuded. Forest fires are also common in the hills during the dry season.
Prasat Preah Vihear and border lines on dispute
There is not much wildlife in the Dângrêk Mountains. Wild hog, deer, barking deer, rabbit,
squirrel, gibbon and civet are some of the animals to be found in the areas where there has been no habitat loss
due to human encroachment.
The Dangrek Mountains mountains were part of the ancient Khmer
Empire, which spread northwards across them, culminating with the almost complete control of the Isaan area in
1220 under Jayavarman VII. Among the archaeological remains in the mountain area
there are stone carvings on the Pha Mo I-Daeng cliff, ancient stone-cutting quarries, as well as the Sa Trao
reservoir. There are also remains of sanctuaries that were built as homes to spirits called Phi Ton Nam (watershed
spirits) in different spots along the border area of the Dangrek mountain chain. However, the largest and most
important archaeological site in these mountains is the Prasat Preah
Vihear compound, a Shaivite temple of the Khmer imperial times dated from the reign of Suryavarman II (1002-49) in a dramatic location on top of a high hill.
Even though some areas have been cleared, vast numbers of landmines were laid as part of a huge
planned operation using thousands of conscripted workers along the Dângrêk mountain range and other parts of the
Thai Cambodian Border. This mine belt is known as the K-5. The purpose was to keep Pol Pot and the Khmer Rouge in
Thailand. These are part of the legacy of the violent conflicts that engulfed Cambodia in the latter part of the
In 1975, the final area held by the ill-fated Khmer Republic in any form would be the Preah
Vihear Temple in these mountains. FANK forces occupied the place for a few weeks in late April that year, after the
fall of the ineffective and beleaguered Lon Nol regime. The hill where the temple stands was finally taken by the
Khmer Rouge on 22 May.
Between 1975 and 1979 many Cambodians fled the violence in their country across these mountains.
In one of the worst cases of enforced repatriation in UN history, the Thai military forcefully sent as many as
40,000 refugees back into Cambodia often through heavily mined areas despite their unwillingness to return. Many
would die of lack of food and exposure in the mountains. To compound matters, there were also bandits hiding in the
forests preying on the refugees. At that time there were many corpses, lying rotting unburied, strewn about the
In the 1984 movie The Killing Fields, the Dângrêk Mountains are the final escarpment that Pran,
portrayed by actor Haing S. Ngor, climbs in order to reach the safety of the refugee camp across the border in
Thailand. The contrast between the steep-faced Cambodian side and the smooth northern slope of the cordillera is
well displayed in this movie.
After the end of the Vietnamese occupation of Cambodia in 1989 and the withdrawal of the
Vietnamese army, the Khmer Rouge rebuilt their former bases in the Dangrek mountain range area, along the border of
Cambodia in order to fight against the CPAF, the armed forces of the State of Cambodia. Anlong Veng, a small town
at the foot of these hills, became for a while the main "capital" of the Khmer Rouge. In the 1990s the Khmer Rouge
still controlled Anlong Veng, where there was one of the first "Killing Fields" after the fall of "Democratic Kampuchea".
There is a still not excavated site in a forest with landmines in the Dângrêk Mountains, located
about 6 Km out of Anlong Veng where 3,000 people were allegedly killed by the Khmer Rouge for having become
"corrupted" as late as between 1993 and 1997. These executions were carried out during Ta Mok's leadership in the
in 1959, The Thai military seized the ancient Khmer Preah Vihear temple from Cambodia. In 1962
Cambodia gained worldwide recognition for sovereignty from the International Court. Recently the issue of Cambodian
sovereignty has been used by certain nationalist factions in Thailand as a tool to help discredit the current Thai
government as part of the continuing power struggle within Thailand.