Archive · 6 Sep 2026
Massive landslide disrupts two rivers in Sikkim’s Mangan district
A large piece of a hillside fell down in Sikkim’s Mangan district.
It happened early on Sunday near a road and a tunnel.
The landslide was close to where the Teesta and Chyakoong rivers meet.
Rocks and soil partly blocked both rivers.
Officials say nobody has been hurt or killed.
They are checking whether nearby property was damaged.
Water levels at two monitoring posts are normal, but the water is muddy.
Officials will keep watching the rivers for changes.
A massive landslide struck Sikkim’s Mangan district in the early hours of Sunday.
Part of a hillside along a new road cutting on Naga-Tosa Road collapsed near Theng Tunnel.
The collapse occurred near the confluence of the Teesta and Chyakoong rivers in Chungthang subdivision.
The landslide partially blocked the flow of both rivers, officials said.
No casualties or injuries have been reported, while authorities assess possible property damage and monitor river levels.
- Who
- Officials and the local administration reported and are monitoring the incident.
- What
- A massive landslide partially blocked the flow of the Teesta and Chyakoong rivers.
- When
- In the early hours of Sunday.
- Where
- Along Naga-Tosa Road near Theng Tunnel, in the Naga Forest area of Chungthang subdivision, Sikkim’s Mangan district.
- Why
- A substantial portion of the hillside along a new road cutting collapsed; the articles do not state a further cause.
- District
- Mangan district, Sikkim
- Location
- Naga Forest area, opposite Theng Tunnel
- Road
- Naga-Tosa Road
- Rivers affected
- Teesta and Chyakoong rivers
- Impact
- Flow of both rivers was partially blocked
- Casualties
- No casualties or injuries reported so far
- River conditions
- Levels at Sankalang and Phidang outposts were normal, but the water was muddy