The city is set at a significant place at the junction of Ymittos and Penteli foothills. The limits of Gerakas expand from Stavros up to the Koufos and Desi Hills, 12 km northeast of the centre of Athens and just 2 km west of Pallini. The city has a population of 29,939 residents (in 2011), covering a land area of 6.633 km2 and having a population density of 4,514 residents per km2. Gerakas can be seen at an elevation of 190 to 374 metres, giving the area both flat and mountainous characteristics.