is the second- highest  mountain on Earth, after  Mount Everest . With a peak elevation of 8,611 m (28,251 feet), K2 is part of the  Karakoram   Range , and is located on the border [ 2 ]  between  Gilgit , in  Gilgit-Baltistan  of  Pakistan  and the  Taxkorgan Tajik Autonomous County  of  Xinjiang