The Bunun population is the third largest of the Taiwan aboriginal groups, and they occupy the second-largest area. They have been the most successful of Taiwan Aborigines in the expansion of their territory through migration. The average Bunun settlement size is quite small compared to other Taiwan aborigines. A 1938 survey reported an average settlement size of 111.22 persons. Also, the Bunun are located in the higher elevations of Taiwan. A 1929 survey by T. Kano reported that 68.2 percent of Bunun settlements were located above 1,000 meters. Bunun settlements can be divided into three types that are localized in different parts in Taiwan: (1) large settlements with strict clan organization in the north; (2) smaller and more isolated settlements in the east and the center; (3) scattered and isolated settlements in the south which, except for state-imposed administrative divisions, lack clear boundaries.