The geography of the municipality of Chaidari is diverse: the eastern part, where the town Chaidari is situated, is densely populated and forms a continuous built up area with the inner suburbs of Athens. The rocky Aigaleo hills run through the central part of the municipality. The pine forest of Dafni and the Daphni Monastery lie on the eastern slopes of Aigaleo. The westernmost part of Chaidari is the small industrial port town Skaramagkas, on the Saronic Gulf near Eleusis. The main roads of Chaidari are the Greek National Road 8 (the old road from Athens to Corinth) and the Iera odos.
The Haidari concentration camp (Greek: στρατόπεδο συγκέντρωσης Χαϊδαρίου, stratópedo syngéntrosis Chaidaríou, German: KZ Chaidari) was a concentration camp operated by the German Schutzstaffel in Haidari during the Axis Occupation of Greece from September 1943 to September 1944.