Lagonissi is a seaside residential area in the Athens Riviera and the southern part of Kalyvia Thorikou in East Attica. It is situated close to the shore and on a peninsula by the Saronic Gulf. Lagonisi is located approximately 30 km southeast of Athens and 35 km northwest of Cape Sounio. Restaurant facilities, cafeterias and bars are located mainly at the heart of Lagonissi, close to Kalyvion Avenue. It is part of Athens metropolitan area.