LakeSerious risk

Tsomgo (Changu) Lake

East Sikkim, on the Nathu La road · Sikkim

A glacial lake ~40km from Gangtok, hugely popular but sitting near 3800m where mild AMS is common.

Visit-safety grade
Serious

Manageable with care. The biggest factor is altitude / ams: 3753 m — very high altitude. Est. SpO₂ ≈ 86% arriving unacclimatised. AMS common; HAPE/HACE possible. Sleeping-gain limits are critical.

Altitude / AMS28 pts
3753 m — very high altitude. Est. SpO₂ ≈ 86% arriving unacclimatised. AMS common; HAPE/HACE possible. Sleeping-gain limits are critical.
Remoteness / rescue12 pts
Remote — real medical help and evacuation are hours away.
Water3 pts
Still water; standard boating and slippery-edge caution.

At 3753 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 43/100, 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
  • AMS/headache/breathlessness after a fast drive from Gangtok to ~3800m
  • icy roads, snow and cold especially in winter and early morning
  • crowded lakeshore with slippery, uneven frozen ground
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
Photos

Photos via Wikimedia Commons — full attribution on the credits page.

The essentials
Nearest town
Gangtok
Elevation
3,753 m
Visit
Roadside / drive-up
Approach
≈0.2 km each way · 10 m climb
Season
Mar–May, Oct–Dec (open most of year; winter snow)
Permits
1 to arrange (Sikkim)
How to reach
Starting point
Gangtok
Sikkim
By air
  • Gangtok (Sikkim) (PYG)~24 km
  • Siliguri (IXB)~88 km
By rail
  • New Jalpaiguri (NJP)~84 km
  • New Bongaigaon~203 km
By road

Drive to the roadhead Gangtok. From Gangtok (Sikkim) (~24 km) shared taxis and state buses run the last leg to Tsomgo (Changu) Lake.

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
0°, clear skies· wind 3 km/h

Live from Open-Meteo at this spot, adjusted to 3,753 m. Mountain weather turns fast — treat this as a hint, not a promise.

Altitude & air
Very high altitude
Elevation
3,753 m
Oxygen vs sea level
~62%
Est. SpO₂ (unacclimatised)
~86%
Air pressure
490 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 Tsomgo (Changu) Lake(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
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Low
Loktak Lake
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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.