Gerakas expands vertically between the mountain junction, covering an area of 6.6 km2, reaching an elevation of 374 metres up to the land of Penteli. The city is located 12 kilometers northeast of Athens and 2 km west of Pallini. It is surrounded by the Municipalities of Agia Paraskevi, Halandri, Vrilissia, Penteli, the Commune of Anthoussa, as well as the Municipalities of Pallini and Glika Nera. At first, it was enclosed geographically within the Athens basin, but due to borders allocation it was partially removed towards the mesogean plain, losing pieces of Patima, Pefka and Stavros from Chalandri and Agia Paraskevi and gaining parts of Balana from Pallini. Substantially, Gerakas is a part of the northeastern part of Athens, as it receives large amounts of athenian population during the recent years.