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Mesogeion Avenue (also spelled as Messogeion Avenue) is an avenue connecting to Feidippou Street with service access with Kifissias, Vassilissis Sofias and Alexandras Avenue and with Marathonos Avenue at the Gerakas Street/GR-81 junction between Glyka Nera and Gerakas with an overpass. It is rarely a part of Greek National Road 54. The total length is approximately 3 km. The historic Marathon Run lines with this avenue.

The origin of the name of the avenue is not to be confused with Mesogeiou. It is named after the Mesogeia Plain to which it leads, and it is at the plain boundary with the Athenian plain. In Greek, the street name for Mesogeia is pronounced Mesogeion and not Mesogeiou (which refers to the Mediterranean Sea), and the accent is at the third syllable, not on the second.

Mesogeion Avenue intersects with Michalakopoulou Street and crosses the Katechaki Interchange, and since 2004 crosses the Attiki Odos section. It intersects the main route for the westbound lanes of the Attiki Odos, and the Hymettus Ring for the Katechaki-bound traffic nearly 1 km west of the overpass, and the Geraki Street/GR-89 overpass.
History

The avenue was first paved in the early to mid 20th century. In the 1960s and the 1970s, the avenue was widened to two lanes in each direction, taking several years to complete. The Ellinikí Radiofonía Tileórasi and the radio station facility opened at the 5th km point on the east side in Agia Paraskevi. An overpass with Gerakas Street and Greek National Road 81 (Gerakas-Lavrio) opened and the Katechaki Avenue interchange was later opened as well. In the 1990s, lampposts which used to be on the side of the avenue were moved to the centre and the avenue was partially reconstructed. An overpass 1 km from the today's Attiki Odos overpass was constructed in the 1990s and the early 2000s and was completed in 2002 before the opening of the Hymettus Ring section of the Attiki Odos. Also in the 2000s, the renovation of Mesogeion-Feidippou-Kifissias-Vasileias Sofias-Alexandras Junction was renovated removing the left turn from the southbound lane. It was completed before the 2004 Summer Olympics in 2004.
Places

Athens
Agia Paraskevi
Cholargos
Chalandri
Glyka Nera
Neo Psychiko
south of Gerakas