Aspropyrgos is a Western suburb, in the Athens metropolitan area and a municipality in the West Attica regional unit, Attica, Greece. The municipality had a population of 31,381 at the 2021 census. It has an area of 101.983 km2.

Elefsina or Eleusis is a suburban city and municipality in Athens metropolitan area. It belongs to West Attica regional unit of Greece. It is located in the Thriasio Plain, at the northernmost end of the Saronic Gulf. North of Elefsina are Mandra and Magoula, while Aspropyrgos is to the northeast.