What is the snow wall from behind which snowball?

The snow wall refers to a massive barrier of snow that forms along roads in mountainous regions, particularly after heavy snowfall. It is often associated with snow removal efforts, where plowed snow is pushed to the sides, creating towering walls of snow. In some contexts, such as in Japan, these snow walls can reach impressive heights, attracting tourists who come to see and walk alongside them. The term "snowball" in this context is not clear, but it could refer to the playful act of throwing snowballs, which is a common winter activity near snow walls.