Deep within the tropical forest sea of the Yarlung Zangbo Grand Canyon, Bujun Lake, also known as Buchung Tso or Sigong Lake, lies quietly in Beibeng Township, Medog (Methok) County, Nyingchi, Tibet. Often described as one of Medog’s most secretive natural wonders, the lake remains largely untouched, preserved by dense forests, misty mountains, and limited access.
In the Lhoba language, “Bujun” means “weighing pan”, a name inspired by the lake’s unique crescent shape. Cradled by mountains and clouds year-round, Bujun Lake feels like a hidden world suspended between the Tibetan Plateau and the tropical lowlands.
Basic Overview of Bujun Lake
Bujun Lake is a natural tectonic lake formed by geological movements and enclosed by steep mountain terrain. Its setting at a relatively low altitude makes it especially rare within Tibet.
- Official Name: Bujun Lake (Buchung Tso)
- Alternate Name: Sigong Lake
- Location: Southeast of Beibeng Township, Medog County, about 15 km from Medog town
- Altitude: Approximately 1,600 meters
- Lake Area: About 11.5 square kilometers
- Total Scenic Area: Around 580 square kilometers
- Shape: Crescent-shaped or irregular oval
- Distinct Feature: A hidden northern outlet where lake water plunges down as a waterfall into the Sigong River
This discreet lake outlet forms one of the area’s most iconic sights—a roaring waterfall cascading directly into the river below.
A Rare Landscape at the Edge of the Plateau
Situated in the core zone of the Yarlung Zangbo Grand Canyon, Bujun Lake occupies a unique geographical position. It lies on the southeastern edge of the Qinghai–Tibet Plateau, where highland and tropical landscapes merge.
Surrounded by steep slopes and dense forests, the lake is frequently wrapped in drifting clouds and mist. This combination of low altitude, high rainfall, and dramatic terrain creates an environment unlike anywhere else in Tibet.
Crystal Waters and a Canvas of Changing Colors
The water of Bujun Lake is exceptionally clear, appearing like a jade-green mirror set within evergreen broadleaf forests. From sunrise to moonlight, the lake transforms continuously.
- Early morning: Soft fog blankets the surface, with mountain peaks emerging like shadows
- Mid-morning: Sunlight scatters across the water, revealing shades of red, purple, gold, and emerald
- Midday: The lake reflects blue skies, white clouds, and lush green peaks in perfect symmetry
- Evening: Golden sunset tones wash across the surface
- Night: Under moonlight, the lake deepens into dark green, with shimmering reflections dancing on gentle waves
During May and June, purple iris flowers bloom across parts of the lakeshore, adding seasonal color to the already stunning scenery.
Primeval Forests and Subtropical Climate
Bujun Lake lies within a mountain subtropical evergreen broadleaf forest zone, where warm temperatures and high humidity dominate throughout the year. The air is fresh, rich with forest scents, and filled with the sounds of insects and birds.
Vegetation around the lake includes:
- Stone oaks and Castanopsis
- Qinggang oak and winged trees
- Podocarpus
- Fishtail palms
- Terminalia chebula
- Large vines, epiphytes, and rare flowering plants
This dense vegetation plays a crucial role in preserving the lake’s water quality and supporting its fragile ecosystem.
A Biodiversity Hotspot in Southeast Tibet
Bujun Lake is widely regarded as one of Medog’s most important biodiversity zones, making it invaluable for ecological research and conservation.
Birdlife
The lake is a key breeding ground for the brown-necked hornbill, a national first-class protected species and one of only three hornbill species found in China. Swans, wild ducks, and many other rare birds can also be seen throughout the year.
Wildlife
The surrounding forests are home to a wide range of animals, including:
- Grey langurs
- Takin
- Red goral
- Asiatic black bear
Animal activity is frequent, especially during early morning and dusk, giving the area the feel of a natural wildlife sanctuary.
Xigong Monastery and Human Presence
Nearby stands the historic Xigong Monastery (Sigong Temple), a long-standing spiritual center for local communities. Pilgrims continue to visit the monastery for worship, and together with Bujun Lake, it forms a unique scene often described as “lake light and temple shadows.”
The region is also home to Lhoba and Monpa ethnic communities, whose cultures are deeply connected to the forest environment. Visitors may encounter traditional clothing, handicrafts, and customs that reflect centuries of coexistence with nature.
Legends and Local Mysteries
Bujun Lake is surrounded by stories that add an air of mystery. Local legends speak of “Chu Sin”, crocodile-like creatures said to reach up to four meters in length, with broad heads and small eyes.
There are also tales of wildmen living deep in the forest. According to Luoba elders, these beings are tall, long-armed, covered in silver-grey hair, and possess striking red eyes. Whether folklore or misidentified wildlife, these stories remain part of the lake’s cultural landscape.
Practical Travel Information for Visitors
Access and Permits
- Border Permit Required: Visitors must obtain a border permit specifying “Medog County, Nyingchi”
- No Direct Road Access: Bujun Lake can only be reached on foot
- Starting Point: From Yarang Village in Beibeng Township, near the Xigong River hydropower station
- Local Guide Mandatory: Trekking must be done with experienced local guides
Best Time to Visit
- Best Season: April to October
- Flower Season: May to June
- Autumn Scenery: October to November offers clear skies and rich colors
Important Precautions
- Leeches are common in rainforest areas—wear long sleeves, secure trouser legs, and use leech repellent
- Some areas restrict drone use; confirm regulations in advance
- Protect the ecosystem—no hunting, fishing, or plant collection
- Road and weather conditions in Medog can change quickly; transport and accommodation should be planned carefully
Bujun Lake is often described as a green gem hidden within Medog’s “secret lotus” landscape, drawing deep travelers, nature lovers, and explorers who seek places still ruled by forests, water, and silence.