The Frozen River is a treacherous waterway currently covered by a thick layer of snow following a recent snowstorm. It serves as a significant geographical feature in the conflict between the Lion Clan and the Unicorn Clan, acting as a natural barrier and potential crossing point for military maneuvers. The surrounding mountainous terrain poses challenges for troop movements and is particularly hazardous due to icy conditions. The river is characterized by an icy surface that can be deceptive; the ice is prone to breaking, creating risks for those attempting to cross.
During military operations, Kitsu Somalia and Matsu Morozane led their units across the Frozen River as part of a maneuver. Kitsu Somalia's archers faced danger when the ice broke beneath them, resulting in one casualty and multiple instances of panic before they reformed. In contrast, Matsu Morozane's cohort completed the crossing without casualties or panic. The crossing of the Frozen River was pivotal, allowing Lion Clan forces to advance toward their objective in the mountains while highlighting the precarious nature of the terrain.