evidence: Siachen Glacier, piedmont glacier located in the Karakoram Range. It lies in the heavily glaciated Himalayan region known as the "Third Pole," because mountain glaciers in this region contain more fresh water than is found anywhere else on Earth except for the polar ice caps. The Siachen Glacier lies between the Saltoro Ridge, a subrange of the Karakorams, to the west and the main Karakoram Range to the east. It is 75 km (47 miles) long, which makes it the second longest nonpolar glacier in the world, after Fedchenko Glacier in Tajikistan. It is believed to have been up to 165 km (103 miles) long in the past, on the basis of evidence of glaciation events that occurred some 145,000 years ago.