Correct Option: A

The Baltoro Glacier, at 62 kilometers long is one of the longest glaciers outside the polar regions. It is located in Baltistan, in the Gilgit-Baltistan region of Pakistan, and runs through part of the Karakoram mountain range. The Baltoro Muztagh lies to the north and east of the glacier, while the Masherbrum Mountains lie to the south. At 8,611 m, K2 is the highest mountain in the region, and three others within 20 km top 8,000 m. The glacier gives rise to the Shigar River, which is a tributary of the Indus River.