The sanctuary is located 37.2 km NNE of Athens at a sacred spring; it contained a temple of Amphiaraos (with an acrolithic cult statue), as well as a theater, stoa, and associated structures. The temenos extended for some 240 metres northeast from the Temple of Amphiaraos (hence Amphiareion) along a streambed. The cult, which was both public and private, dates to the 5th century BCE.
The sanctuary is situated 37.2 km NNE of Athens near a holy spring; it featured a temple dedicated to Amphiaraos (accompanied by an acrolithic cult statue), along with a theater, stoa, and related structures. The sacred enclosure stretched approximately 240 meters northeast from the Temple of Amphiaraos (hence Amphiareion) alongside a streambed. The religious practice, which was both public and private, dates to the 5th century BCE.