Round-up Time: Canadian Cowboys Stage Huge Drive. North of the border, it's round-up time on Canada's largest ranch, where the spirit of the old west lives on. On the 510,000 acre spread, hard-riding cowpokes drive vast herds to winter ranges throughout the great panorama of the last western frontier. Cattle walk through landscape. Cowboys on horses -- one has a cigarette in his mouth, like a famous ad campaign -- round up herds and eat by a fire.