The city has been traditionally divided into two distinct parts and periods, even if there is some overlap both in time and design, and together they cover some 16 square kilometres. The earliest, in the south, is native Maya dating to the Epiclassic period (c. 800-1000 CE) with buildings displaying the distinct 'Puuc' architectural style and Maya hieroglyphs. The plan is more spread out than other parts of the city and, constructed on a roughly north-south axis, may reflect the course of the Xtoloc Cenote water source.