| Harmanli to Opwijk | 1,200.84 mi (1,932.56 km) |
| Harmanli to Ostend | 1,258.37 mi (2,025.16 km) |
| Harmanli to Oud-Heverlee | 1,177.85 mi (1,895.56 km) |
| Harmanli to Oud-Turnhout | 1,178.99 mi (1,897.41 km) |
| Harmanli to Oudenaarde | 1,221.31 mi (1,965.51 km) |
| Harmanli to Oudenburg | 1,254.05 mi (2,018.19 km) |
| Harmanli to Oupeye | 1,135.33 mi (1,827.13 km) |
| Harmanli to Overijse | 1,181.85 mi (1,902.01 km) |
| Harmanli to Overpelt | 1,159.11 mi (1,865.40 km) |
| Harmanli to Paal | 1,163.47 mi (1,872.43 km) |
| Harmanli to Peer | 1,155.17 mi (1,859.06 km) |
| Harmanli to Pepinster | 1,124.36 mi (1,809.49 km) |
| Harmanli to Peruwelz | 1,213.70 mi (1,953.26 km) |
| Harmanli to Perwez | 1,166.23 mi (1,876.86 km) |
| Harmanli to Philippeville | 1,166.09 mi (1,876.64 km) |
