pratiyogita kiran the people of the region can be divided into three broad
groups from the ethnological point of view-hill tribes plain tribes and
non-tribals of the plains the population varies from as low as 43 per sq km
in arunachal pradesh to 398 per sq km in assam.the region has over 160
scheduled tribes and over 400 other tribal and sub-tribal communities and
groups. ethnically most tribes belong to the indo-mongoloid racial stock pratiyogita kiran book.
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