Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Greek National Road 51 (GR-51) is a highway in northeastern Greece. It connects the Greek National Road 2 (Florina - Thessaloniki - Alexandroupoli - Turkey) near Feres with the Bulgarian border near Ormenio. The main towns on the GR-51 are Didymoteicho and Orestiada. The entire GR-51 is part of the European route E85. Its length is about 128 km. It runs from south to north, parallel to the river Evros. The southern end of the GR-51 is in the village Ardani, part of the municipality Feres, about 40 km east of Alexandroupoli. Here it branches off the GR-2 (the old Egnatia Odos). 2 km north is a new interchange with the Egnatia Odos freeway. The highway bypasses Soufli, Didymoteicho and Orestiada. At Kastanies there is a connecting road to Karaa aç and Edirne in Turkey. The highway ends near Ormenio at the Greek-Bulgarian border. The only major river that the highway passes over is the Arda in the north.