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The eastern part of the Himalayas form the Purvanchal.
1. They are mostly composed of strong sandstones (sedimentary rocks).
2. They are covered with dense forests.
The Purvanchal comprises of the Patkai, Naga, Manipur and Mizo hills.

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It is mostly covered with dense forests,it contains sedimentary rocks.the purvanchal contains patkai,mizo,naga and manipur hills.