Frozen rivers are ice-cold rivers either partially or completely frozen over. Fictional frozen rivers are often found in frozen regions or winter wonderlands and can act either as dangerous terrain to navigate or a quaint location upon which characters can skate. In partially frozen rivers, floating ice chunks may be moving downriver, offering worldbuilders an opportunity for characters to treat these icy islands as terrain that can navigated by foot or carefully avoided by boat. Frozen rivers may possess frozen waterfalls. There may be areas of the ice that is weak, and characters may fall through and into the freezing (and potentially fast moving) water beneath. Frozen rivers may represent easy ways to move through a frozen area, either by skate or by sled.