The river Giri is an important tributary of the Yamuna River. It is the main source of water in the South-Eastern Himachal Pradesh. The Giri or Giriganga is famous in the Jubbal, Rohru hills that rises from Kupar peak just above Jubbal town after flowing across the heart of Shimla hills and then flows down in the Southeastern direction dividing the Sirmaur district into equal parts that are known as Cis-Giri and Trans-Giri region and joins Yamuna upstream of Paonta below Mokkampur.

The river Ashni merges with the Giri near Sadhupul ( Chail ) while river Jalal which flows from Dharthi ranges adjacent to the Pachhad joins it at Dadahu from the right side. The water from the Giri River is taken through a tunnel to the powerhouse of Girinagar and after that it is led into the Bata River.

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