KALKAS, or KHALKKAS  , a Mongoloid people mainly concentrated in the northern steppes of Mongolia near their kinsmen, the Buriats . According to Sir H . Howorth they derive their name from the river Kalka, which runs into the Buir lake . Of all Mongolians they physically differ most from the true Mongol type (see MONGOLS) . Their colour is a brown rather than a yellow, and their eyes are open and not oblique . They have, however, the broad flat face, high cheekbones and lank black hair of their race . They number some 250,000, and their territory is divided into the four khanates of Tushetu (Tushiyetu), Tsetien (Setzen), Sai'noi'm (Sain Noyan) and Jesaktu (Jassaktu) .