The Baltoro Glacier (), at in length, is one of the longest glaciers outside the polar regions. It is located in the Gilgit-Baltistan region of Pakistan. It runs through part of the Karakoram mountain range. The Baltoro Muztagh lies to the south and east of the glacier, while the Masherbrum Mountains lie to the south. At 8,611 m (28,251 ft), K2 is the highest mountain in the region, and three other Eight thousanders within 20 km.