Serling Tso, also known as Siling Co, Selin Co, or Zerling Mtsho, is one of the most spectacular and remote lakes on the Tibetan Plateau. Located in northern Tibet’s vast Changtang region, this enormous high-altitude lake is surrounded by open grasslands, snow-covered mountains, wetlands, and some of the plateau’s most remarkable wildlife.
Known locally as Selin Co (色林错), the lake lies at an elevation of roughly 4,500 meters above sea level. It is also famous for its unusual Tibetan name, often translated as “Demon Lake”, which is connected with centuries-old Buddhist and Tibetan folklore.
Serling Tso is more than a beautiful natural attraction. Its changing size has attracted scientific attention, while its wetlands provide important habitat for the black-necked crane and other high-altitude wildlife. For travelers interested in Tibet’s remote landscapes, wildlife, geography, and culture, Serling Tso offers an experience far removed from the better-known tourist destinations around Lhasa.
Serling Tso at a Glance
| Feature | Details |
|---|---|
| English Names | Serling Tso, Siling Co, Selin Co |
| Chinese Name | 色林错 |
| Tibetan Name | སེར་གླིང་མཚོ་ |
| Meaning | Commonly interpreted as “Demon Lake” |
| Elevation | About 4,530–4,540 m |
| Surface Area | More than 2,300 km², depending on the measurement period |
| Location | Northern Tibet, mainly around Xainza and Baingoin counties |
| Lake Type | Inland, closed-basin lake |
| Water | Saline |
| Region | Changtang, Nagqu |
| Wildlife | Black-necked crane, Tibetan antelope, Tibetan wild ass, bar-headed goose and other plateau species |
| Protected Area | Selin Co National Nature Reserve and associated wetland conservation areas |
| Best Travel Period | May to October |
Lake area measurements vary between surveys and years because Serling Tso has been expanding. Satellite-based studies have documented substantial growth over recent decades.
Where Is Serling Tso?
Serling Tso is located in the northern part of the Tibet Autonomous Region, within the vast Changtang landscape of Nagqu. The lake is associated particularly with Xainza and Baingoin counties, and its surrounding watershed includes an extensive network of smaller lakes, rivers, wetlands, and alpine grasslands.
At more than 4,500 meters above sea level, Serling Tso is considerably higher than most famous lakes around the world. The surrounding landscape is typical of northern Tibet: broad open plains, rugged mountains, distant glaciers, seasonal wetlands, and almost no permanent settlements.
The remote location is part of its appeal. Unlike Namtso, which is one of the most popular day-trip destinations from Lhasa, Serling Tso receives far fewer visitors.
Is Serling Tso the Largest Lake in Tibet?
Yes. Serling Tso is generally recognized as the largest lake in Tibet by surface area.
For many years, Namtso was commonly described in travel literature as Tibet’s largest lake. However, satellite observations have shown that Serling Tso expanded considerably over the past several decades. A long-term dataset covering 1972–2020 records continuous expansion and notes that Serling Tso became larger than Namtso after its connection with the Yagen Lake system.
Scientific studies have also documented significant changes in the lake’s size. One study found that its area increased from about 2,023 km² in 2003 to approximately 2,318 km² in 2013, representing an increase of around 14.6 percent during that period.
Another study reports that the lake expanded from approximately 1,617 km² in the mid-1970s to around 2,341 km² in the 2010s.
This means that the exact surface area quoted for Serling Tso depends on the year and measurement method. Rather than treating the lake as having one fixed area, it is more accurate to describe it as Tibet’s largest lake and one of the fastest-changing large lakes on the Tibetan Plateau.
Why Is Serling Tso Expanding?
The expansion of Serling Tso is an important example of how the Tibetan Plateau is responding to climate change.
Research shows that the lake region has experienced a generally warmer and wetter climate, while changes in glacier and snow melt, evaporation, precipitation, and runoff have affected the amount of water entering the lake.
Several factors are involved:
Glacier and Snowmelt
Rising temperatures can increase the amount of meltwater entering rivers and streams that eventually flow into the lake. Studies of the Siling Co basin indicate that glacier runoff is an important contributor to changes in lake water levels and storage.
Changing Precipitation
Changes in rainfall and snowfall across the Tibetan Plateau also affect the lake’s water balance. Because Serling Tso occupies a large closed basin, changes in the amount of water entering the system can have a significant effect on lake level and surface area.
Reduced Evaporation
Changes in wind speed, temperature, humidity, and other climatic conditions can alter evaporation. Research into long-term evaporation trends around Siling Co suggests that reduced evaporation has contributed to the recent expansion of the lake.
A Closed Inland Basin
Serling Tso is part of an endorheic, or closed, drainage system. Water enters through rivers, streams, snowmelt, and other sources but does not flow out to the sea through a major surface outlet.
As water accumulates, the lake can expand across the surrounding low-lying terrain.
An Ancient Lake System
Serling Tso is not an isolated body of water. It forms part of a much larger lake and wetland system across northern Tibet.
The region contains numerous neighboring lakes and interconnected water bodies. Geological evidence indicates that the ancient lake system was once much larger than today’s Serling Tso. Over thousands of years, climatic changes caused the ancient lake environment to contract and fragment into separate basins.
Today, the landscape around Serling Tso resembles a vast natural network of lakes, wetlands, rivers, grasslands, and smaller satellite lakes.
This makes the area particularly important for understanding the geological and climatic history of the Tibetan Plateau.
Why Is Serling Tso Called “Demon Lake”?
Legend 1: Guru Rinpoche and the Demon Serling
According to local tradition, a giant demon named Selin once terrorized the inhabitants of Toelung Dechen near Lhasa, devouring countless living beings. The great 8th-century Buddhist master Padmasambhava (Guru Rinpoche) hunted the demon across the vast northern wilderness.
Cornered at a murky lake, Selin submitted to Guru Rinpoche. The master commanded the demon to remain forever beneath the water’s surface, repent for his sins, and never harm aquatic life again. The lake was named Selin Due Tso (“Selin’s Demon Lake”).
Legend 2: The Defeat of King Ajiong
Another legend tells of King Gesar defeating the demon king Ajiong. As Ajiong lay dying, he begged King Gesar for water. The king severed Ajiong’s head and threw it into Serling Tso so he could drink endlessly. Legend holds that this is why rivers continuously feed into Serling Tso without it ever overflowing, and why its waters turned salty.
A Paradise for Black-Necked Cranes
One of the most important reasons Serling Tso matters is its wildlife.
The lake and surrounding wetlands form part of a major protected ecosystem for the black-necked crane, one of the world’s most distinctive high-altitude crane species.
The Selin Co National Nature Reserve was established to protect black-necked cranes and the fragile alpine wetland ecosystem on which they depend. The reserve also supports a wide range of other birds and mammals.
The internationally recognized Tibet Selincuo Wetlands are also listed under the Ramsar Convention as wetlands of international importance. Ramsar records document black-necked cranes and other important waterbirds within the wetland ecosystem.
Wildlife Around Serling Tso
Visitors may encounter or observe evidence of several remarkable Tibetan Plateau species, including:
- Black-necked crane
- Tibetan antelope
- Tibetan wild ass (kiang)
- Snow leopard
- Argali sheep
- Bar-headed goose
- Brown-headed gull
- Himalayan and Tibetan mountain birds
The enormous size of the protected landscape allows wildlife to move through relatively undisturbed alpine grasslands and wetlands.
For wildlife enthusiasts, Serling Tso is especially valuable because it offers a glimpse into one of the world’s great high-altitude ecosystems.
The Serling Tso Wetland Ecosystem
Serling Tso is not simply a lake surrounded by dry grassland. Its wider ecosystem includes marshes, shallow wetlands, river mouths, islands, alpine meadows, and grasslands.
These habitats support migratory birds during different stages of their annual journeys.
The combination of water and surrounding grassland is particularly important in northern Tibet, where the climate is harsh and freshwater wetlands are limited. Protecting these habitats helps preserve both resident species and migratory birds.
Climate Around Serling Tso
The climate around Serling Tso is typical of the high Tibetan Plateau.
At an elevation of more than 4,500 meters, temperatures can remain low even during summer. Winters are extremely cold, and strong winds are common.
During summer, daytime conditions can be relatively comfortable under direct sunlight, but temperatures can fall rapidly after sunset.
Travelers should be prepared for:
- Strong ultraviolet radiation
- Sudden weather changes
- Cold temperatures
- Strong winds
- Very dry air
- Limited oxygen
- Possible snow even outside the winter season
The high elevation makes acclimatization particularly important.
How to Visit Serling Tso
Serling Tso is a destination for remote overland travel, rather than a conventional sightseeing stop.
A typical northern Tibet route may connect the lake with places such as Nagqu, Xainza, Nima, or other destinations in the Changtang region, depending on the itinerary and current road conditions.
The journey itself is part of the experience. Travelers pass through vast landscapes where the horizon can stretch for hundreds of kilometers, with herds of yak, Tibetan antelope, wild asses, and other wildlife sometimes visible from the road.
Because northern Tibet is remote, travel arrangements should be made with an experienced Tibet travel agency familiar with local permits, road conditions, accommodation, and high-altitude logistics.
Is Serling Tso Easy to Reach?
No. Serling Tso is considerably more remote than popular destinations such as Namtso or Yamdrok Tso.
There are long stretches without fuel stations, restaurants, hotels, or medical facilities. Road conditions can also change depending on weather and seasonal maintenance.
Travelers should therefore avoid treating Serling Tso as a simple independent road trip.
A professional driver and properly planned itinerary are strongly recommended, particularly for international visitors traveling through remote areas of northern Tibet.
Best Time to Visit Serling Tso
The most practical period for traveling to Serling Tso is generally late spring through early autumn, especially from May to October.
- May to June: Spring brings the landscape back to life. Migratory birds become active, and snow remains visible on surrounding mountains.
- July to August: Summer offers relatively accessible road conditions and greener grasslands. The contrast between blue water, open grassland, and dramatic skies can be spectacular.
- September to October: Autumn often brings clearer skies, golden grasslands, and excellent conditions for landscape photography. However, temperatures become colder as winter approaches.
- Winter: Winter travel is much more challenging because of extreme cold, ice, snow, and difficult road conditions. It is generally unsuitable for ordinary sightseeing trips.
Photography at Serling Tso
Serling Tso is particularly impressive for landscape photography.
The enormous scale of the lake makes it difficult to capture its full size in a single photograph. Wide-angle landscapes work especially well, while elevated viewpoints can show the relationship between the lake, surrounding wetlands, grasslands, and mountains.
For the best light, consider shooting:
- Early morning
- Late afternoon
- Sunset
- After rainfall when clouds create dramatic skies
Wildlife photography requires patience and an appropriate distance. Visitors should never chase animals or approach nesting birds.
Serling Tso vs. Namtso
Travelers often ask whether they should visit Serling Tso or Namtso.
| Feature | Serling Tso | Namtso |
|---|---|---|
| Size | Tibet’s largest lake | Smaller than Serling Tso |
| Elevation | About 4,530–4,540 m | About 4,718 m |
| Accessibility | Remote and difficult | Easier from Lhasa |
| Tourism | Very limited | Well developed |
| Landscape | Vast wilderness and wetlands | Dramatic lake and mountain scenery |
| Wildlife | Exceptional | Good |
| Cultural significance | Strong local traditions | Major Tibetan Buddhist pilgrimage site |
| Best For | Adventure, wildlife and wilderness | Scenic sightseeing and pilgrimage |
If your priority is convenience and iconic Tibetan scenery, Namtso is the easier choice.
If you want remote landscapes, wildlife, and a deeper experience of northern Tibet, Serling Tso is far more adventurous.
Why Serling Tso Is Important
Serling Tso represents much more than Tibet’s largest lake.
It is simultaneously:
- A major high-altitude wetland
- An important black-necked crane habitat
- A sensitive indicator of environmental change
- A key part of the Changtang ecosystem
- A landscape deeply connected with Tibetan folklore
- One of the most remote natural attractions in Tibet
Its changing water level and expanding surface area also provide scientists with valuable information about environmental changes across the Tibetan Plateau. Long-term research has documented significant expansion of Siling Co and links the changes to variations in climate, runoff, glacier melt, and evaporation.
Frequently Asked Questions About Serling Tso
What is Serling Tso famous for?
Serling Tso is famous for being the largest lake in Tibet, its remote location in the Changtang region, its expanding surface area, and its importance as a habitat for black-necked cranes and other Tibetan Plateau wildlife.
How high is Serling Tso?
The lake sits at approximately 4,530–4,540 meters above sea level, although published measurements vary slightly depending on the reference and survey method.
Is Serling Tso bigger than Namtso?
Yes. Long-term satellite-based observations show that Serling Tso has expanded significantly and is now larger than Namtso by surface area.
Why is it called Demon Lake?
The name is associated with Tibetan legends about a demon named Selin who was subdued by Padmasambhava. The English translation “Demon Lake” comes from this traditional association.
Can tourists visit Serling Tso?
Yes, but it is a remote destination requiring careful planning. Access, permits, road conditions, accommodation, and local travel regulations should be checked before departure.
What animals live around Serling Tso?
The region supports black-necked cranes, Tibetan antelope, Tibetan wild asses, argali sheep, bar-headed geese, brown-headed gulls, and other high-altitude wildlife. The protected area is also important for rare predators such as the snow leopard.
When is the best time to visit Serling Tso?
For most travelers, May to October offers the most practical conditions. Summer provides greener landscapes and active birdlife, while September and October can offer particularly clear skies and beautiful autumn scenery.
Final Thoughts
Serling Tso is one of the wildest and most extraordinary landscapes in Tibet.
Its enormous blue waters, endless Changtang grasslands, snow-covered mountains, remote wetlands, and abundant wildlife create a landscape that feels almost untouched.
What makes the lake even more fascinating is that it is still changing. Scientific observations show that Serling Tso has expanded considerably over recent decades, making it an important natural record of environmental change on the Tibetan Plateau.
For travelers willing to venture beyond Tibet’s better-known attractions, Serling Tso offers something rare: a journey into the remote heart of the Tibetan Plateau, where geography, wildlife, climate, and ancient Tibetan traditions come together around one extraordinary lake.
