Gerakas and Glyka Nera. Most of the forest is in the north, and much of the mountain is rocky, deforested, grassy and made out of limestone.

The flanks of Hymettos are dotted with caves. The largest and most notable is , which has its entrance on the east flank of the mountain, near Paiania. The smaller Liontari cave has its mouth at the north end of the mountain, west of Glyka Nera and is named after