“…Frost-resistant potatoes can be grown under certain conditions as high as 4,500 m, and herding settlements are found as high as 5,210 m (Bowman 1916 : 52, figure 24). The remains of agropastoral infrastructure such as residences, walls, corrals, and irrigation canals and large special-purpose sites (cemeteries and pukaras, or forts) are common west of the lake (Stanish et al 1997;Flores 1979 : 45 -50). Vegetation is annually burned off to improve grazing.…”