The Braldu River is a long river, that originates from the Baltoro Glacier and flows to the west where it receives melt waters from the Biafo Glacier. The Baltoro Glacier and the Biafo Glacier are among the largest glaciers outside the polar regions. The Baltoro Glacier give rise to the four Eight-thousanders mountain peaks, among them is the K2 , the second highest mountain peak of the world. The Biafo Glacier holds the Snow Lake, which is 61 mile (100 km) river of ice, it is among the world's longest continuous glacier systems outside of the polar regions.