In the last ice age, a connected series of glaciers stretched from western Tibet to Nanga Parbat, and from the Tarim basin to the Gilgit District. To the south, the Indus glacier was the main valley glacier, which flowed down from Nanga Parbat massif to elevation. In the north, the Karakoram glaciers joined those from the Kunlun Mountains and flowed down to in the Tarim basin.