Argon Pedion
Argon Pedion is a small, closed karst basin in the Arcadian highlands of the Peloponnese in southern Greece. Its name means “untitled/plain,” a reference from ancient writer Pausanias who described the grassland as a plain that floods in winter. Heavy rains can fill the area and even create a temporary lake, but underground drainage through karst channels usually prevents a permanent body of water.
Geography and climate: Arcadia is mostly rural and mountainous, with few towns and forests in the central north and along the southern border. The region has a Mediterranean climate: hot, dry summers and mild, wet winters. Water is scarce in the long summer droughts, so managing rainfall and groundwater is important for people, farming, and livestock.
Geology and hydrology: The Peloponnese mainly sits on carbonate rocks that have been fractured by tectonic forces. Rain and water flowing through these fractures slowly dissolve the rock, creating underground drainage and caves. In Argon Pedion, two mountains at the basin’s southern end form a narrow bottom that acts like a dam. When winter rain is heavy, surface water can flood the plain and even cover it temporarily. Water then drains underground through katavothras (water lifts) and reappears at the Kiveri springs in the Argolic Gulf. The journey from the basin to the sea takes roughly 190 hours. In some winters, larger flows cause a more noticeable flood.
Historical notes: The ancient traveler Pausanias described the route into Arcadia and the “Ladder,” a zigzag descent into Argon Pedion with steps cut into the rock. He also noted that water from the mountains disappeared underground and later came back at the Kiveri spring. This shows that even in ancient times, people understood the basin’s unusual hydrology.
People, land use, and water management: The area is dominated by traditional farming and shepherding. When the plain floods, sheep and goats graze the surrounding slopes and the fertile plains are used for gardens and terraces. In the upper part near Saga, crops are grown on alluvial soils and slope terraces. Water for irrigation is collected in wells and drainage ditches that lead to the katavothra. Modern irrigation water is carried by a 5-meter-wide concrete canal about 15 kilometers to the Argos plain. Agriculture here remains largely small-scale and traditional, with limited mechanization.
Infrastructure: Arcadia’s transportation network is modest. A major highway runs along the Corinthian Gulf from Athens to Patras, and another connects Corinth with Tripoli and Megalopoli toward the south. A narrow-gauge railway once served the region but was closed in 2011.
Significance: Argon Pedion is part of the larger Tripoli Basin and has been studied to understand Greece’s karst hydrology. The ancient descriptions, the physical geography, and the ongoing water management practices all reflect a long relationship between people and this unique, water-driven landscape.
This page was last edited on 2 February 2026, at 15:06 (CET).