Physical setting
Landlocked
geographic context
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Geography & Environment
Geography & Environment in Laos
VientianeLocal time
Geography & Environment
Laos is a landlocked, largely mountainous country whose valleys and lower plains are organized around the Mekong and its tributary network.
Relief anchor
Mountainous interior and Mekong lowlands
regional relief reference
Laos at a Glance
Laos is a landlocked, largely mountainous country whose valleys and lower plains are organized around the Mekong and its tributary network.
Physical geography
terrain · drainage · setting
Laos is predominantly mountainous and deeply dissected, with highlands covering much of the north and east and lower plains concentrated along the Mekong and major tributary valleys. The relief focus used here is Mountainous interior and Mekong lowlands, presented as a regional physical reference.
Regional frameSouth-Eastern Asia
SettingLandlocked
Relief focusMountainous interior and Mekong lowlands
Climate pattern
The climate is tropical monsoon, with a pronounced wet season and dry season and cooler conditions in higher northern and eastern terrain.
Water and landform context
The Mekong is the dominant river system along much of the western side, receiving numerous steep tributaries that drain the mountainous interior.
Terrain, Climate and Environment
Three connected views of Laos's physical setting.
Relief and terrain
PhysicalLaos is predominantly mountainous and deeply dissected, with highlands covering much of the north and east and lower plains concentrated along the Mekong and major tributary valleys. The relief reference on this page is Mountainous interior and Mekong lowlands.
Climate pattern
ClimateThe climate is tropical monsoon, with a pronounced wet season and dry season and cooler conditions in higher northern and eastern terrain.
Environmental setting
EnvironmentThe Mekong is the dominant river system along much of the western side, receiving numerous steep tributaries that drain the mountainous interior.
Understand the landscape
What Laos's geographic profile is telling you
Steep relief and monsoon rainfall make the Mekong system central to Laos’s physical geography, connecting highland catchments with lower river valleys and floodplains.
Detailed Geography & Environment Data
| Measure | Reference | Basis |
|---|---|---|
| Physical setting | Landlocked | Geographic classification |
| Relief anchor | Mountainous interior and Mekong lowlands | Regional physical feature |
| Climate | The climate is tropical monsoon, with a pronounced wet season and dry season and cooler conditions in higher northern and eastern terrain. | |
| Terrain | Laos is predominantly mountainous and deeply dissected, with highlands covering much of the north and east and lower plains concentrated along the Mekong and major tributary valleys. | |
Frequently Asked Questions
What kind of terrain does Laos have?
At country scale, the main terrain pattern is: laos is predominantly mountainous and deeply dissected, with highlands covering much of the north and east and lower plains concentrated along the Mekong and major tributary valleys.
What is Laos's climate like?
The climate is tropical monsoon, with a pronounced wet season and dry season and cooler conditions in higher northern and eastern terrain.
What physical feature helps explain the landscape?
A useful way to read the landscape is through the relationship between relief and drainage. The Mekong is the dominant river system along much of the western side, receiving numerous steep tributaries that drain the mountainous interior.
Sources & methodology
This physical-geography profile uses Lao PDR Third National Communication to the UNFCCC (2024) to support the terrain, climate, drainage and regional relief descriptions shown on this page. The summary focuses on broad, stable physical features.
View sources used for this page
Lao PDR Third National Communication to the UNFCCC (2024)
Country-authored institutional source used for the physical-geography claims on this page.