Geraneia Mountains or Yerania Ori (Greek: Γεράνεια Όρη) are a mountain range in Corinthia and West Attica, Greece.

Its highest point is the peak Makryplagi (Greek: Μακρυπλάγι), elevation 1,351 m.[2] It covers the northern part of the isthmus between the Gulf of Corinth and the Saronic Gulf.

The geography of Geraneia includes forests in the south, the west and the northern part at an elevation of under 900 to 1,000 m. Barren land is in the central part.

During the Peloponnesian War, the Corinthians and their allies occupied the heights of Geraneia and marched to Megara with a large force.

The wolf pack of Geraneia Mountains is the southernmost in Greece, possibly in Europe, too.