Abstract
Recent opinions as to the size and character of ancient Tiahuanaco, Bolivia, vary greatly. On the basis of published information, it is impossible to assess these important aspects of the site. A two-day survey during November, 1966, strongly suggests a true urban character for Middle horizon Tiahuanaco. At that time the urban core covered approximately 2.4 km2. A range of population between 5,200 and 10,500, and possibly up to 20,000 people, is suggested. Tiahuanaco’s strategic location with respect to three major environmental zones is regarded as a crucial factor in the site’s economic and political importance.

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