So I just read the chapter and it confirmed my suspicion : he talked about the frozen Zanskar river. There's many documentaries on this winter route along the narrow gorges of Zanskar range. Since there are now many roads leading out from Zanskar, It is now a very popular route amongst trekkers, known as 'chadar', meaning sheet of ice. It leads to Leh, the capital of that district.

This particular glacier leads to nowhere but extreme mountains and vast icefields at the ridges of the Great himalayan range, altitudes exceeding 6000 meters. There are many such Glaciers parallel to it, and I, did in fact trek on them on a completely Uncharted route.

Let me know if you wanna see an album full of pics from the route.