Markax pusir jaljatänawa; each camp was divided into 20 districts (calpullis, Nahuatl calpōlli); and each calpulli, or 'big house', was crossed by streets or tlaxilcalli. There were three main streets that crossed the city, each leading to one of the three causeways to the mainland of Tepeyac, Ixtapalpa, and Tlacopan.[6] Bernal Díaz del Castillo reported that they were wide enough for ten horses. Surrounding the raised causeways were artificial floating gardens with canal waterways and gardens of plants, shrubs, and trees.[7] The calpullis were divided by channels used for transportation, with wood bridges that were removed at night.