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TheDoon Valley is an unusually wide, long valley within theSivalik Hills and theLesser Himalayas, in theIndian states ofUttarakhand,Himachal Pradesh andHaryana. It is closer to Kyarda Doon, which lies in Himachal Pradesh. Within the valley lies the city ofDehradun, the winter capital of Uttarakhand state.
The Doon Valley lies between two intermittent ranges of theHimalayas, the Outer Himalayas (a.k.a. theSiwalik Hills) to the south[1] and the Lesser Himalayas, known locally as the Mussoorie Range. It is bounded on all sides by mountains, with northern range running fromKalsi in the west toMuni Ki Reti in the east withMussoorie at the centre in a semi-circular arc; and southern range running at south fromPaonta Sahib in the west toHaridwar in the east. The valley also forms a watershed between theYamuna andGanges river systems. In fact, the Yamuna and Ganges are closest to each other as they pass the Doon valley, with the Yamuna forming the western boundary and the Ganges the east. It runs 75 km long from west to east.
The Doon Valley is ecologically rich, particularly with regard to birdlife, with over 500 bird species having been recorded within the valley and in the surrounding areas, including theMussoorie Hills andRajaji National Park. TheReserved Forests and community forests in the region, in and around the valley are also botanically rich in terms ofhardwood deciduous forests (esp.Sal orShorea robusta, andTeak), flowering and fruiting trees, naturalwetlands, andTerai andBhabar ecosystems. Several rivers (e.g.Song,Tons, Suswa, Jakhan, Rispana and Asan) and a number of lesser streams flow through the valley, having their sources in either the Mussoorie Hills or the Sivalik Hills; all local rivers ultimately flow into either the Ganges or the Yamuna. Other than Rajaji National Park, the local protected areas includeAsan Barrage Conservation Reserve andJhilmil Jheel Conservation Reserve, with the 1000-acre campus of theForest Research Institute inDehradun representing anotherImportant Bird Area (IBA).
The valley is known for pleasant summers but winter temperatures may drop below the freezing point.[2]
Rajaji National Park,Kalesar National Park andJaunsar-Bawar region adjoin the valley as well.
In Uttarakhand:
In Himachal Pradesh:
30°21′40″N77°59′31″E / 30.361°N 77.992°E /30.361; 77.992
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