"For the farmers of the high country the snowline is their boundary". So begins the narration to this National Film Unit documentary. Beautifully shot by Brian Brake, the challenges of farming the vast stations on the rugged aprons of the Southern Alps are captured. The centrepiece is the great autumn muster where shepherds and dogs work 16,000 sheep down from "the tops" over 100,000 acres of peaks and glaciers, before the snow and winter blizzards arrive. "It's mutton every meal out here - we chase sheep every day and eat them every meal."