Kosi river system

The Kosi or Sapt Kosi drains eastern Nepal. It is known as Sapt Koshi because of the seven rivers which join together in east-central Nepal to form this river. The main rivers forming the Kosi system are – the Sun Kosi River, the Indravati River, the Bhola Koshi, the Dudh Kosi

Dudh Kosi

-Kosi river system:The Kosi or Sapt Kosi drains eastern Nepal. It is known as Sapt Koshi because of the seven rivers which join together in east-central Nepal to form this river. The main rivers forming the Kosi system are – the Sun Kosi, the Indravati River, the Bhola Kosi, the Dudh Kosi, the Arun...

, Arun River, Barun River

Barun River

The Barun River is a tributary of the Arun River and is part of the Kosi river system in Nepal.-Kosi river system:The Kosi or Sapt Kosi drains eastern Nepal. It is known as Sapt Koshi because of the seven rivers which join together in east-central Nepal to form this river...

, and Tamur River

Tamur River

The Tamur River is a major river in eastern Nepal, which begins around Kanchenjunga. The Tamur and the Arun join the Sun Kosi at Tribenighat to form the giant Saptakoshi which flows through Mahabharat Range on to the Gangetic plain-Kosi river system:...

. The combined river flows through the Chatra gorge in a southerly direction to emerge from the hills.

Course

It rises in the south-facing slopes of the main Himalayan range. The catchment of this river extends from the eastern rim of the Kathmandu basin to the Indravati – Sun Kosi water divide. That includes the eastern slopes of Kathmandu basin.

The Indravati River flows over a steep gradient, resulting in large rapids in its upper course. The steep edges virtually terminate at the water’s end. The water flows past inter locking spurs. Alpine, sub-alpine and temperate forests occur at different heights in the catchment area. Small villages have come up along the middle and lower courses.The Indravati meets the Sun Kosi

Sun Kosi

The Sun Kosi or Matsang Tsangpo is a trans-boundary river and is part of the Kosi or Sapta Kosi river system in Nepal. It originates in Tibet Autonomous Region of China.-Etymology:...

 at Dolalghat. It is on the Arniko Highway linking Kathmandu with the Nepal-Tibet border.