Purvanchal hills are composed of string sandstones which are sedimentary rocks.

 

 

An Eastern boundary of the Himalayas is demarcated by the river Brahmaputra.

Beyond the Dihang gorge area, the Himalayas bend sharply to the south, spread along the eastern boundary.

Also called Purvanchal or the eastern hills and mountains.

Purvanchal hills are composed of string sandstones which are sedimentary rocks.