An ice stupa is like a giant icicle that is made by humans in places where there is not enough water. It is made by collecting water during the winter when it is really cold and then letting it freeze into a tall tower shape. Once it gets warmer, the ice stupa starts to melt, releasing water for people to use for drinking, bathing, and farming. The ice stupa is a clever way for people to store water and make it last longer, especially in places where water is hard to come by. It's kind of like a big popsicle that helps people survive!