The Zanskar River freezes in the winters. The entire river looks like a sheet of ice and hence is referred to, in the local language, as Chadar. From a tourism point of view, this trek has been popularized as the frozen river expedition and draws in several amateur and professional trekkers from different parts of the country and the world.
Chadar trek is one of the most adventurous and most difficult treks in the country. The distance that is covered on foot is approximately 105 km and on an average, a trekker covers 15 to 17 km every day. The temperatures are usually 5 to 0 degrees during the day time and plummet to -25 to -35 degrees during the night in this region.
While most of the trek is completed by walking, trekkers may even have to climb icy rocks and boulders during the journey. During the journey, the trekkers will walk on the sheet of ice to cover the distance and will rest in caves during the night time.
Due to the extremely cold conditions that a person has to face during this expedition, it is advisable that every aspirant fully understands the conditions that he will face ahead and prepare accordingly. 
