| Castelginest to Opwijk | 518.67 mi (834.72 km) |
| Castelginest to Ostend | 525.01 mi (844.92 km) |
| Castelginest to Oud-Heverlee | 515.95 mi (830.34 km) |
| Castelginest to Oud-Turnhout | 551.99 mi (888.34 km) |
| Castelginest to Oudenaarde | 504.73 mi (812.28 km) |
| Castelginest to Oudenburg | 522.61 mi (841.06 km) |
| Castelginest to Oupeye | 523.20 mi (842.01 km) |
| Castelginest to Overijse | 510.87 mi (822.16 km) |
| Castelginest to Overpelt | 551.90 mi (888.20 km) |
| Castelginest to Paal | 536.68 mi (863.70 km) |
| Castelginest to Peer | 547.09 mi (880.45 km) |
| Castelginest to Pepinster | 517.44 mi (832.74 km) |
| Castelginest to Peruwelz | 482.10 mi (775.86 km) |
| Castelginest to Perwez | 504.39 mi (811.73 km) |
| Castelginest to Philippeville | 472.87 mi (761.01 km) |
