Greek National Road 16a is a national highway in Chalkidiki, Central Macedonia, Greece. It connects Polygyros with Greek National Road 16 near Agios Prodromos.
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| Εθνική Οδός 16a | |
| Major junctions | |
| North end | Agios Prodromos |
| South end | Polygyros |
| Location | |
| Country | Greece |
| Regions | Central Macedonia |
| Highway system | |
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