Along with Kallanka architecture, Kancha architecture was widely used throughout the Inca Empire. Kanchas were groups of primarily residential, rectangular spaces generally comprising a single room, one story high, and a shared patio space. Each Kancha grouping was surrounded by an enclosure wall of stone. Some were gabled, some not, but all tended to cover their stone bases with thatched roofing, which was pitched to control the flow of rainwater. These complexes housed large numbers of people in easily defensible locations, and their organized nature lent themselves to convenient civil administration.