A high, dry, landlocked country
Mongolia is a large landlocked country wedged between Russia to the north and China to the south, east and west. It sits on a high plateau, with an average elevation that is often given as roughly 1,500 meters above sea level. The country is not one flat sheet of grass, though. Mountain chains run through the west, center and northeast. Between them lie wide basins, river valleys and some very large lakes, and in the south the land opens into the Gobi.
Understanding Mongolian geography is mostly a matter of seeing three things: where the mountains are, which way water runs off them, and where it collects. Once those are clear, the pattern of forests, pastures, deserts and travel routes starts to make sense.
The three great mountain systems
The Altai forms the western and southwestern edge of the country. The Mongolian Altai includes the highest ground in Mongolia, around the Tavan Bogd massif near the junction with Russia and China, where the highest summit, Khuiten Peak, is commonly given as a little over 4,300 meters. To the southeast the range continues as the Gobi Altai, lower, drier and more broken. The region is covered in more detail under the Altai Mountains, and its ice is discussed separately in the article on Altai glaciers.
The Khangai sits in the center-west. Its mountains are broad, rounded and heavily grazed, rising to a highest peak, Otgontenger, a little under 4,000 meters. Many of the country’s important rivers rise here, and the surrounding area includes pastureland that has supported herding for centuries. The Orkhon Valley lies on its northern and eastern flank.
The Khentii lies in the northeast, closer to the capital. It is forested, cooler and wetter than much of the country, and it is the source of rivers that flow in different directions. It carries deep historical associations because of its ties to the Mongol origin story.
Other significant ranges include the Khovsgol mountains in the north, which meet the Siberian taiga, and various smaller ranges and isolated massifs scattered across the south.
Three drainage systems
Because Mongolia is so high and so far from any ocean, water has few ways out. The country is usually described as belonging to three drainage systems.
- Arctic Ocean basin. Rivers such as the Selenge, which gathers water from the Khangai and other northern ranges, flow into Lake Baikal in Russia. From Baikal the water continues on its long way toward the Arctic. This is the most important system for farming and forests in the north.
- Pacific Ocean basin. In the northeast, rivers such as the Onon rise in the Khentii and eventually join systems that run toward the Pacific.
- Central Asian internal basin. Large parts of the west and south drain into lakes and salt pans, or simply vanish into the desert. Water here never reaches the sea.
This internal drainage explains why so many Mongolian lakes are salty. Water arrives, evaporates and leaves minerals behind.
Lakes and basins
The northwest contains the Great Lakes Depression, a broad basin between the Altai and Khangai. It holds several large lakes, including the saline Uvs Nuur, which is one of the largest lakes in Mongolia by surface area. Near the Gobi-Altai there is a chain of lakes and marshes sometimes called the Valley of the Lakes.
In the far north, Lake Khovsgol is the great exception to the salty rule. It is deep, freshwater and surrounded by forested mountains, and it is often described as holding a very large share of the country’s surface fresh water. Its winter freeze creates a different landscape altogether, covered in the article on frozen lakes.
Many other lakes exist across the steppe and mountains. Some are small and seasonal, others occupy volcanic or glacial hollows, such as the freshwater lake at Terkhiin Tsagaan in the Khangai. The sizes of lakes can change noticeably in wet and dry years, so figures should be treated as approximate.
Rivers
The Selenge is generally regarded as the country’s largest river by flow, and its basin includes the Orkhon, the Tuul that passes Ulaanbaatar, and others. Farther east, the Kherlen and Onon begin in the Khentii and travel in very different directions. Many smaller rivers in the south flow only seasonally.
For travelers, rivers matter in practical ways. They shape where herders camp in summer, where roads cross valleys, and when crossings become difficult after rain or snowmelt. It is wise to check road conditions locally rather than assume a river crossing will be easy.
The south: Gobi and dune country
South of the Gobi-Altai the landscape changes. Rock, gravel plains, dry basins and sand dunes dominate. Not all of the Gobi is sand. In fact, most of it is rocky or gravelly, with scattered shrubs. Famous sand areas, such as Khongoryn Els, are discussed under sand dunes, while the red cliffs known for fossil finds are in the Flaming Cliffs article. A broader look at all of these environments appears in the overview of Mongolian landscapes.
How geography shapes travel
A few practical patterns follow from all this:
- Mountain areas generally mean cooler weather, even in summer, and quicker changes in conditions.
- Lakes and river valleys concentrate wildlife and herding camps, which makes them popular for visitors, though they can be crowded in peak summer.
- Distances look small on a map but can take a long time on unpaved tracks, so itineraries need generous time. Planning advice is in the trip planning basics.
- Many highland and border areas require permits, so check the rules on protected area permits before heading out.
The cluster of articles that follows looks at individual features in more detail, from the Selenge to the Khangai hot springs and the Khentii forests. Any single article is a snapshot; conditions, names and figures can shift, so treat the details here as a starting point and confirm specifics from current official sources before you travel.