The northern part of the municipality is covered by the forested Parnitha mountains. The southern part is in the plain of Athens, and is densely populated. The built-up area of Acharnes, in this southern part of the municipality, is continuous with that of the adjacent suburbs to the west, east and south. The centre of Acharnes is 11 kilometres (7 miles) due north of Athens city centre. The two other settlements in the municipality, Thrakomakedones and Varympompi, are situated further north, in the foothills of Parnitha.