Answer:
The Eastern Hills are collectively known as Purvanchal. These hills running through the north-eastern states are mostly composed of strong sandstones which are sedimentary rocks. They are covered with dense forest; they mostly run as parallel ranges and valleys. Purvanchal comprises of the Mizo hills, Naga hills, Manipur hills, Patkai Bum, Garo, Khasi and Jaintia hills.
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