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- The Hasdeo Aranya Region (Aranya means forest) lies in the catchment area of the Hasdeo river in North-Central Chhattisgarh.
- The Hasdeo Aranya forests are called the lungs of Chhattisgarh.
- The Hasdeo River is a tributary of the Mahanadi river which originates in Chhattisgarh and flows through Odisha into the Bay of Bengal.
- The Hasdeo forests are also the catchment area for the Hasdeo Bango Dam built across the Hasdeo river which irrigates six lakh acres of land, crucial to a State with paddy as its main crop.
- Hasdeo Arand, a sprawling forest in the northern part of Chhattisgarh is known for its biodiversity and its coal deposits.
- Besides, the forests are ecologically sensitive due to the rich biodiversity they offer and due to the presence of a large migratory corridor for elephants.
- Hasdo River rises at a height of 915 meter at a place near to Sonhat in the Sarguja district of Chhattisgarh.
- The Hasdo river covers a length of nearly 333 km to merge into the Mahanadi river on its left near to the village Mahuadih.
- The total drainage area of the Hasdo river is 9,856 sq. km, which is about 6.96% of the Mahanadi basin area.
- The principal sub tributary of the Hasdo River is Gej River.
- Hasdo River merge into the Mahanadi River in Chandarpur in Chattisgarh, 28 km before Mahanadi river reaches the Hirakud Dam.
- Hasdeo Bango Dam is constructed across this river.