13.8000°N, 89.3920°W.
San Andres is a Maya site in the Zapotitan Valley of central El Salvador, occupied principally between approximately 600 and 900 CE during the Late Classic period. The site sits on the western edge of the volcanic landscape devastated by the Ilopango eruption around 410 CE and by the Loma Caldera eruption around 600 CE that buried the nearby village of Joya de Ceren. San Andres was the regional administrative capital that grew during the recovery, and at its peak controlled the surrounding valley population. The principal architecture, built of adobe and stone, includes a great acropolis platform with a stepped pyramid known as the Campana, residential compounds, and a series of plazas. Stanley Boggs conducted early excavations in the 1940s, with renewed Salvadoran-Japanese work by Kuniaki Ohi and others in the 1990s. The Campana pyramid stands consolidated and accessible.
San Andres remained occupied through the Maya Postclassic before final abandonment.