| Ardahan to Opwijk | 1,942.64 mi (3,126.38 km) |
| Ardahan to Ostend | 1,998.84 mi (3,216.82 km) |
| Ardahan to Oud-Heverlee | 1,920.80 mi (3,091.22 km) |
| Ardahan to Oud-Turnhout | 1,910.69 mi (3,074.96 km) |
| Ardahan to Oudenaarde | 1,967.26 mi (3,166.00 km) |
| Ardahan to Oudenburg | 1,995.12 mi (3,210.83 km) |
| Ardahan to Oupeye | 1,877.48 mi (3,021.51 km) |
| Ardahan to Overijse | 1,926.27 mi (3,100.03 km) |
| Ardahan to Overpelt | 1,891.26 mi (3,043.70 km) |
| Ardahan to Paal | 1,900.35 mi (3,058.32 km) |
| Ardahan to Peer | 1,888.98 mi (3,040.03 km) |
| Ardahan to Pepinster | 1,868.87 mi (3,007.66 km) |
| Ardahan to Peruwelz | 1,966.26 mi (3,164.39 km) |
| Ardahan to Perwez | 1,912.98 mi (3,078.65 km) |
| Ardahan to Philippeville | 1,922.20 mi (3,093.47 km) |
