I am going Himachal Pradesh to the Lahul Spiti area next weekend, and I would like to know more about the Chandratal. What exactly is Chandratal (all I know is that it is a lake, anything more)? Is Chandratal known by any other names? Is this only accessible by trekkers? If it is only accessible by trekking, is it worth visiting? If I do visit Chandratal, please give your advice and inputs so it will be useful when I visit the place.