Plasi is located on the northeastern coastline of Attica, only 200 m away from the sea. The available evidence suggests a continuous human presence that spans over 3000 years, from the Late Neolithic to Early Byzantine times. The strategic location of Plasi at the entrance of the Euboean gulf along with its proximity to important monuments of history and prehistory, such as the Tumulus of the Athenians and the prehistoric cemeteries of Klopa, Tsepi and Vranas, makes the archaeological investigation of the site even more important.