LakeSerious risk

Cholamu Lake (Tso Lhamo)

North Sikkim plateau, Mangan district · Sikkim

Among the highest lakes in India, on the arid Tibetan-border plateau near the Teesta's source, usually access-restricted.

Visit-safety grade
Serious

Manageable with care. The biggest factor is altitude / ams: 5330 m — very high altitude. Est. SpO₂ ≈ 73% arriving unacclimatised. AMS common; HAPE/HACE possible. Sleeping-gain limits are critical.

Altitude / AMS28 pts
5330 m — very high altitude. Est. SpO₂ ≈ 73% arriving unacclimatised. AMS common; HAPE/HACE possible. Sleeping-gain limits are critical.
Remoteness / rescue18 pts
Very remote — assume you are on your own in an emergency.
Water3 pts
Still water; standard boating and slippery-edge caution.

At 5330 m, altitude is the quiet risk. Arriving from low elevation in a single day gives your body no time to adjust — pace the climb where you can, and learn the early signs of AMS.

Score 49/100, re-derived from the site’s real characteristics — never a marketing grade. A higher number is not “don’t go”; it is “go informed.”

Know before you go
  • extreme-altitude AMS/HAPE/HACE risk after a fast climb above 5000m
  • bitter cold and desiccating wind on an exposed high-desert plateau
  • border-zone remoteness with essentially no rescue or medical infrastructure
The safety code · lakes
  • If it sits high, the thin air — not the water — is the real risk; don't race up from the plains, and learn the signs of AMS.
  • Alpine water and weather turn dangerously cold fast, even in summer — carry warm layers.
  • Remote shores mean slow rescue; share your plan and turn back with time to spare.
When to go
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Prime windowShoulderOff-season
The essentials
Nearest town
Thangu / Lachen
Elevation
5,330 m
Visit
Roadside / drive-up
Approach
≈0.3 km each way · 15 m climb
Season
May–Oct (special permit, weather permitting)
Permits
1 to arrange (Sikkim)
How to reach
Starting point
Thangu / Lachen
Sikkim
By air
  • Gangtok (Sikkim) (PYG)~93 km
  • Siliguri (IXB)~159 km
By rail
  • New Jalpaiguri (NJP)~156 km
  • New Bongaigaon~241 km
By road

Drive to the roadhead Thangu / Lachen. From Gangtok (Sikkim) (~93 km) shared taxis and state buses run the last leg to Cholamu Lake (Tso Lhamo).

Distances are straight-line (as the crow flies), computed from the coordinates. Real road distance and driving time in the mountains are longer — confirm current road status and the last motorable point with your operator, especially in monsoon and winter.

Right now
−12°, clear skies· wind 7 km/h

Live from Open-Meteo at this spot, adjusted to 5,330 m. Mountain weather turns fast — treat this as a hint, not a promise.

Altitude & air
Very high altitude
Elevation
5,330 m
Oxygen vs sea level
~50%
Est. SpO₂ (unacclimatised)
~73%
Air pressure
402 mmHg

AMS common; HAPE/HACE possible. Sleeping-gain limits are critical.

Where it is
3D replay

See it in 3D

A Google-Earth-style flyby that drops in from orbit and traces the real approach trail up to Cholamu Lake (Tso Lhamo)(where it’s mapped in OpenStreetMap), over real satellite terrain — so you can read the climb and the lie of the land before you go.

More lakes
Serious
Pangong Tso
Ladakh
Serious
Chandratal Lake
Himachal Pradesh
Low
Loktak Lake
Manipur

Coordinates, heights and depths are approximate, curated from public sources — good enough to plan and to gauge risk, not surveyed. The safety grade is a deterministic guide, not a guarantee; conditions change with weather, water level and crowds.