Greek National Road 63 (abbr: EO63) is a national highway in northern Greece.[1] It connects Serres with Promachonas on the Bulgarian border, via Sidirokastro. It is part of the European route E79.
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41°14′58″N 23°22′35″E / 41.2495°N 23.3765°E / 41.2495; 23.3765