Chelmos-Vouraikos National Park National Park

Chelmos-Vouraikos National Park is a protected area in western Greece that includes the Chelmos (Aroania) mountain massif and the Vouraikos Gorge; its highest summits reach about 2,340 meters.

Mount Chelmos features alpine plateaus, karst limestone terrain and areas used for hiking and seasonal recreation, while the Vouraikos Gorge is a steep river canyon carved through limestone cliffs. The gorge is notable for the Odontotos rack railway, which follows the river between the coastal town of Diakopto and the mountain town of Kalavryta over a route of roughly 22 kilometers.

The landscape includes long-standing cultural sites such as the Mega Spilaio monastery on the northern slopes; the area has been used historically for pastoralism and mountain settlement and is now designated as a protected park to conserve its natural and cultural features.

Geographically the park sits in the northern Peloponnese within the administrative region of Western Greece, spanning parts of Achaea and adjoining municipalities, north of the Gulf of Corinth and near the towns of Diakopto and Kalavryta.

• Summit height: The highest parts of the massif reach about 2,340 meters, offering alpine terrain and seasonal snow.
• Odontotos railway: A historic narrow-gauge rack railway follows the Vouraikos Gorge for about 22 kilometers between Diakopto and Kalavryta, providing a well-known scenic route through the park.
• Monastery location: The centuries-old Mega Spilaio (Great Cave) monastery is located on the northern slopes and is a regional cultural landmark within the park area.

What to See#

• Mount Chelmos (Aroania): Rises to roughly 2,340 meters at its highest point and contains alpine plateaus, karst limestone features, and areas used for seasonal grazing and outdoor recreation.
• Vouraikos Gorge and Odontotos railway: A deep river gorge cut by the Vouraikos River and followed by a narrow-gauge rack railway between Diakopto and Kalavryta of roughly 22 kilometers, featuring steep cliffs, tunnels, and trail access along the gorge.

Accessible by regional roads from Patras and nearby Achaea towns; local buses serve some villages, but private car or guided tours are the most flexible ways to explore the park and its trailheads.

• Hike early in the morning to avoid heat and to see wildlife activity along trails.
• Check for seasonal closures related to shepherding or local agricultural use.
• Hire a local guide to reach lesser-known gorges and to learn about the region's ancient olive groves.