The extensive residential zones of the site are composed of dwellings and ancillary domestic structures, with those around the ceremonial district larger and of higher quality and those toward the fringes being generally poorer. The houses are often arranged in small patio groups surrounding small courtyards. Houses were built haphazardly without organized streets. Lanes wind among the residences and walls. The residential areas of the site contain many cenotes, perhaps as many as 40. Settlement was the most dense in the southwestern part of the city where cenotes are more numerous.