Sayil is a Maya archaeological site in the Mexican state of Yucatán, in the southwest of the state, south of Uxmal. It was incorporated together with Uxmal as a UNESCO World Heritage Site in 1996.
Sayil flourished principally, albeit briefly, during the Terminal Classic period. A number of badly damaged monuments suggest that Sayil was governed by a local royal dynasty, with wealth among lineages based, at least in part, upon control of the best agricultural lands.
The site is located in the karst limestone hills of the Puuc region of the northern Yucatan Peninsula.
Sayil is located 7 kilometres (4.3 mi) south of the contemporary Puuc archaeological site of Kabah, 5 kilometres (3.1 mi) from Xlapak and 5 kilometres (3.1 mi) from Labna. It was built in a shallow valley among low, steep hills.
The Puuc region that includes the site of Sayil possesses well defined wet and dry seasons and is characterised by a near absence of surface water due to the porous limestone bedrock.
The site is laid out along a sacbe, or causeway, running from north to south. The Great Palace stands at the northern end of the causeway, it is the largest and most well known building at Sayil.
The Great Palace has an 85-meter-long facade and is built upon a two-terraced platform, giving the impression of three stories. Various rooms are arranged around the four sides of each terrace. The uppermost terrace supports a long structure with a single range of rooms. The palace was built in various phases through an unknown period of time in the Terminal Classic; wings were added and platforms were designed, which were filled with stones and mortar to increase stability. The palace has a central stairway on the south side, giving access to the upper levels of the building.