Manipur is situated on the tertiary ranges of a branch of the eastern Himalayas running south .
Manipur is forms part of the compact physiographic unit following the great divide between the Brahmaputra and Chindwin valleys .
Manipur is situated on the tertiary ranges of a branch of the eastern Himalayas running south and forms part of the compact physiographic unit following the great divide between the Brahmaputra and Chindwin valleys .