The Erymanthos (Greek: Ερύμανθος, Latin: Erymanthus) is a river in the western part of the Peloponnese in Greece. Its source is on the southern slope of Mount Erymanthos, near the village of Agrampela, Achaea. It flows towards the south through a rocky landscape and receives several small tributaries. The river flows into an area rich in pine trees and passes several small mountain villages including Tripotama. Beyond Tripotama it forms the border between Elis and Arcadia. It flows east of the Foloi oak forest. The river empties into the Alfeios 5 km west of the Ladon) confluence, near the village Tripotamia.

Erymanthos
Native name	Ερύμανθος (Greek)
Location
Country	Greece
Physical characteristics
Source
• location	Peloponnese
Mouth
• location	Alfeios
• coordinates	37°35′10″N 21°47′42″E / 37.58611°N 21.79500°E / 37.58611; 21.79500
Length	about 50 km (31 mi)
Basin features
Progression	Alfeios→ Ionian Sea