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Thangu, above Lachen, North Sikkim, Sikkim

Thangu Valley

Thangu is a high valley and small settlement at about 3,900 m above Lachen, the breakfast and acclimatisation stop on the way to Gurudongmar Lake. Rhododendrons in spring, snow in winter. Altitude, permits and tips.

Updated 10 November 2026

Thangu Valley with mountains and a river in North Sikkim
Thangu Valley. Photo: Tarunsamanta, CC BY-SA 4.0, via Wikimedia Commons.
Where
Thangu, about 30 km above Lachen
Altitude
About 3,900 m
Distance
About 30 km from Lachen; about 35 km before Gurudongmar Lake
Timings
Early morning on the Gurudongmar day
Entry fee
Free
Permit
North Sikkim permit needed
Best time
April–June for rhododendrons; October–December for clear skies
Time needed
30–45 minutes

Thangu is the last settlement on the road from Lachen to Gurudongmar Lake, set in a broad valley at about 3,900 m. Most travellers stop here before dawn for tea, breakfast and a short walk to adjust to the altitude before driving on to the lake.

What to expect

In April to June the slopes are covered in rhododendrons; from December the valley is snowbound. Temperatures are below freezing on most mornings outside summer. Carry warm layers, drink water and keep exertion low.

How to reach

Thangu is about 30 km above Lachen. Trips leave Lachen around 4–5 am for Gurudongmar and pass through Thangu. A North Sikkim permit, arranged in Gangtok by a registered operator, is required.

Thangu Valley: questions travellers ask

What is the altitude of Thangu?

About 3,900 m (around 12,800 ft).

Why do Gurudongmar trips stop at Thangu?

For breakfast and to adjust to the altitude before driving on to the lake at over 5,000 m.

Can I stay at Thangu?

Most visitors stay at Lachen and pass through Thangu on the Gurudongmar day.

When are the rhododendrons in bloom?

Usually April to June.

Sources

Timings and fees change. Check on the day, or ask us when you book.

Nearby attractions

All Sikkim attractions