The side of a slab avalanche, forming its lateral boundaries

Credit: Crested Butte Avalanche Center

Two flanks, on each side of the slab, are connected by the crown. They are generally oriented downslope while the crown is oriented across the slope.

A simulated avalanche in motion, showing the flanks on each side of the crown.  Credit: Natural Sciences

Looking downslope at the flanks and bed surface of an avalanche. Credit: Colorado Avalanche Information Center