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Greek National Road 66 is a national highway in southern Greece. It connects Nemea with Levidi, via Skoteini. Near its eastern terminus it intersects with the A7 motorway and then ends at its intersection with EO7.
Ministerial Decision G25871 of 9 July 1963 created the EO66 from the old EO57, which existed by royal decree from 1955 until 1963, and followed the same route as the current EO66. [1] [2]