Pamir(1) and Karakorum within Sinkiang Province
The Sinkiang Pamir top at Kongur(2) at over 7,700 meters, and the Karakorum at K2(3), the world's second tallest moutain--about 8,600 meters high--on the border(4) with Pakistan.
Footnotes
(1) Called the Pamir Mountains or Plateau, or just the Pamir Knot.
(2) Or Kungur.
(3) Or Qagir.
(4) Pakistan claims some land about the Karakorum that China administers, including K2.