The region where these differences first become noticeable lies just south of a chain of mountains called the Vindhya.

CNN: Center Cut

The posts hit by NATO on Saturday are built on the Salala mountain, part of a chain of low-lying rugged mountains that divide Pakistan from Afghanistan.

WSJ: Airstrike Ravages U.S.-Pakistan Ties

Western Ghats (India) : Older than the Himalaya mountains, the mountain chain of the Western Ghats represents geomorphic features of immense importance with unique biophysical and ecological processes.

UNESCO: MEDIA SERVICES

Standing in front of a fleet of gleaming mini-buses, with the snow-capped Pamir mountains in the background, Mr Zanjani talks about the recent chain of events that have catapulted him into the headlines both at home in Iran and abroad.

BBC: Iranian tycoon claims EU sanctions are unfair

The last significant mountains before the Sahara are the arid, pink-and-ochre-coloured chain of the Anti Atlas, and beneath the arid, jagged mass of its two major peaks lie lush irrigated valleys and a string of oases.

BBC: Trekking the unexplored mountains of Morocco

Then, they reach a parking area and take a quarter-mile-long path toward the mountains that leads to a couple of acres of ground enclosed by an eight-foot chain-link fence.

NPR: Revisiting the Birth of the Bomb