Mount Kyllini or Mount Cyllene, also known as Mount Ziria, is a mountain on the Peloponnese in Greece famous for its association with the god Hermes. It rises to 2,376 m (7,795 ft) above sea level, making it the second highest point on the peninsula. It is located near the border between the historic regions of Arcadia and Achaea—in the northeast of Arcadia, and entirely within modern Corinthia. It is located west of Corinth, northwest of Stymfalia, north of Tripoli, and south of Derveni. Several modern places are also named Kyllini.

The Peloponnese, Peloponnesus or Morea is a peninsula and geographic region in Southern Greece, and the southernmost region of the Balkans. It is connected to the central part of the country by the Isthmus of Corinth land bridge which separates the Gulf of Corinth from the Saronic Gulf. From the late Middle Ages until the 19th century, the peninsula was known as the Morea, a name still in colloquial use in its demotic form.