16.2

(a) The Moquegua Valley is located in southern Peru (the area of probable Wari influence is shaded). (b) The Moquegua Drainage is roughly divided into the Middle Valley, which is the area dominated by Tiwanaku settlements, and the steeper upper drainages, which are dominated by Wari-related sites. Nevertheless, each polity had colonial settlements in both areas, and current evidence suggests that for at least some parts of the Middle Horizon, Wari and Tiwanku settlers in the upper drainages shared the use of the same irrigation system (Williams 2001; Williams and Nash 2002).