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Agia Varvara is situated east of the mountain Aigaleo (Greek: Αιγάλεω). It is 6 km (4 mi) west of central Athens. The municipality has an area of 2.425 km. It is served by the Agia Varvara and Agia Marina stations on Line 3 of the Athens Metro.
In terms of academic institutions, the area contains 2 campuses of West Attica University which in total includes approx 60,000 students according to 2023.