The strategic mountaintop location commands the southern entrance to the Sacred Valley. This was the largest inhabited area in the valley with over 20,000 acres terraced and under cultivation. The terraces literally wrap around the mountain from top to bottom.
Much of what I learned here turned everything I previously thought on its head. I thought the valley was settled first and then subsequent terraces were built farther up. Turns out the Wari preferred to start at the top and build down for reasons of safety from both natural disasters and human invasion. Water wasn't the problem I thought since there are two lakes higher up the mountain and the Wari had an extensive irrigation system, some of which is still functioning. Something else I found interesting is that the stone retaining walls of the terraces act as heat reservoirs that increase the temperature of the air on the terraces and continue to radiate heat into the evening thereby increasing crop productivity.