1) Island of Attica 
Psyttaleia (Ψυττάλεια) is an uninhabited island in the Saronic Gulf a few miles off the coast of Piraeus, Greece. It covers an area of 0.375 square kilometers. The island currently houses the largest sewage treatment plant in Europe, with a projected daily maximum drying capacity of 750 tons of sewage. Administratively it is part of the M...