Argon Pedion is the geological name of a "closed karst basin" in the Arcadian highlands in the Peloponnese peninsula of southern Greece. The first known appearance of this name was in a publication by the ancient geographer Pausanias. He called it untilled plain, because the grassland and acres may be flooded beyond the time when annual vegetation starts. When the winter rains were very heavy, floods can even turn the plain into a temporary lake. Intensive karst formation prevents the formation of a permanent lake. In rare cases, even today, modern technologies can not prevent flooding.

Tripoli is a city in the central part of the Peloponnese, in Greece. It is the capital of the Peloponnese region as well as of the regional unit of Arcadia. The homonymous municipality had 44,165 inhabitants in 2021.