Anavyssos is a town and a former municipality in East Attica, Greece located in the Athens Riviera. Since the 2011 local government refor…Anavyssos is a town and a former municipality in East Attica, Greece located in the Athens Riviera. Since the 2011 local government reform it is part of the municipality Saronikos, of which it is a municipal unit. The municipal unit has an area of 14.478 km. At the 2021 census it had 6,180 inhabitants.