People from northern and southern China are physically and genetically different from one another. Head shape, body size and susceptibility to disease vary greatly between the north and south.
People from Beijing and northern China are often heavier and taller and have broader shoulders, lighter skin, smaller eyes and more pointed noses than Southerners. They favor noodles over rice, have the blood of horsemen from Manchuria and Mongolia, and are regarded as "imperious, quarrelsome, rather aloof, political, proud, and less ostentatious and flashy with their money than Southerners.”
People from Shanghai, Canton and southern China are generally smaller, thinner, browner, and have rounder eyes and more rounded noses than Northerners. They favor rice over noodles, ... are regarded as "talkative, friendly, complacent, sloppy, commercial-minded and materialistic."
The dividing line between Northerners and Southerners is the Yangtze River.