Karathona, Blue Flag beach in Nafplio, Greece

Karathona is a sandy and pebbly beach on the Argolic Gulf, a few kilometres southeast of Nafplio in the Peloponnese. It lies in the Nafplio municipality and is reached by the same road that climbs to Palamidi fortress, with a large car park near the shore.

The bay sits below the Palamidi fortress, built during the Venetian period to guard the harbor of Nafplio. This fortification was a crucial part of the region's naval defense system.

Karathona takes its name from the Greek word for the site, Καραθώνα, used for the coastal spot itself rather than the beach alone. In summer the sand-and-gravel shore fills with bathers, and the bay is reached on foot by a 4–5 km coastal promenade from Nafplio as well as by road.

Karathona lies 4 to 5 km southeast of Nafplio, reachable on foot along a well-built coastal promenade or by car on the same road that climbs to the Palamidi fortress. A large car park sits close to the beach. The sand-and-gravel shore is busiest in summer.

The beach is reached either by car on the same road that climbs to the Palamidi fortress, with a large car park near the sand, or on foot along a well-built coastal promenade of 4 to 5 km from Nafplio.