Vietnam has various forms of tug-of-war (kéo co). The characteristics of each form are defined by the ethnic group practicing as well as the location in which the games are performed. While practiced throughout the country, tugging rituals and games are concentrated mostly in the northern midlands, the Red River Delta, and the north central region, the ancient land of the Viet and the cradle of the native wet rice culture and Red River civilization. In addition, the games are played widely by ethnic minorities, such as the Tay, Thai, Giay, La Ha, and H’Mong, in the northern mountains.