It is accessible from Tibet in the north (via Bum La, Se La, Tunga), across the Patkai in the Southeast (via Diphu, Kumjawng, Hpungan, Chaukam, Pangsau, More-Tamu) and from Burma across the Arakan Yoma (via An, Taungup). These passes have been gateways for migration routes from Tibet, Southeastern China and Myanmar. In the west both the Brahmaputra valley and the Barak valley open widely to the Gangetic plains.
This mountain range is accessible from Tibet in the north (via Bum La, Se La, Tunga), across the Patkai in the Southeast (via Diphu, Kumjawng, Hpungan, Chaukam, Pangsau, More-Tamu) and from Burma across the Arakan Yoma (via An, Taungup). These mountain passes have historically served as routes for migrations from Tibet, Southern China and Thailand.