Mount Pentelicus or Pentelikon (, or ) is a mountain range in Attica, Greece, situated northeast of Athens and southwest of Marathon. Its highest point is the peak Pyrgari, elevation 1,109 m. The mountain is covered in large part with forest (about 60 or 70%), and can be seen from southern Athens (Attica), the Pedia plain, Parnitha, and the southern part of the northern suburbs of Athens. Houses surround the mountain, especially in Vrilissia, Penteli, Ekali, Dionysos and north of Gerakas.