Koroni or Corone is a town and a former municipality in Messenia, Peloponnese, Greece. Since the 2011 local government reform it is part of the municipality Pylos-Nestor, of which it is a municipal unit. Known as Corone by the Venetians and Ottomans, the town of Koroni sits on the southwest peninsula of the Peloponnese on the Gulf of Messinia in southern Greece, 56 km by road southwest of Kalamata. The town is nestled on a hill below a Venetian castle and reaches to the edge of the gulf.