Southernmost of a trio of architectural styles in the lowland Maya Classic Period, based on the heavy use of uncut stone and stucco. Large towers imitating the steep stepped temple-pyramids of such centers as Tikal consist entirely of fill which has been plastered over. The style included mosaic facades rather than the modeled stucco of the Greater Peten group. The best example of Rio Bec architecture is at Xpuhil in Campeche.