Ice hockey rink - Wikipedia
https://en.wikipedia.org/wiki/Ice_hockey_rinkAn ice hockey rink is an ice rink that is specifically designed for ice hockey, a competitive team sport. Alternatively it is used for other sports such as broomball, ringette, rinkball, and rink bandy. It is a rectangle with rounded corners and surrounded by walls approximately 1.22 metres (48 in) high called the boards.