 The northern Maya area (Campeche and Yucatán) shows characteristics of its own.Its Classic Puuc, Chenes, and Rio Bec architecture is characterized by the geometrical reduction of realistic decoration; the stacking of rain god snouts to build facades; the use of portals shaped like serpent mouths; and, in the Rio Bec area, the use of solid pseudo temple-pyramids.The most important Puuc site is Uxmal.