The coveted Blue Flags have been awarded to 394 Greek beaches and nine marinas, an increase of seven flags since 2011. Blue Flags are awarded by an International Committee and denote world-class prestige.
reports the Blue Flag Blue Flag "works towards sustainable development of beaches and marinas through strict criteria dealing with Water Quality, Environmental Education and Information, Environmental Management, and Safety and Other Services."
also reports that the European Environment Agency shows Greece has the clearest water for swimming of the Mediterranean countries.
Beaches in Corfu and Chalkidiki swooped the most Blue Flags with 35 each. A full list of Greece's Blue Flag beaches can be found here