| River Grove to Opwijk | 4,134.26 mi (6,653.45 km) |
| River Grove to Ostend | 4,077.87 mi (6,562.69 km) |
| River Grove to Oud-Heverlee | 4,157.07 mi (6,690.16 km) |
| River Grove to Oud-Turnhout | 4,151.65 mi (6,681.43 km) |
| River Grove to Oudenaarde | 4,116.47 mi (6,624.82 km) |
| River Grove to Oudenburg | 4,082.35 mi (6,569.91 km) |
| River Grove to Oupeye | 4,198.00 mi (6,756.03 km) |
| River Grove to Overijse | 4,153.86 mi (6,684.99 km) |
| River Grove to Overpelt | 4,171.26 mi (6,712.99 km) |
| River Grove to Paal | 4,168.58 mi (6,708.68 km) |
| River Grove to Peer | 4,175.63 mi (6,720.03 km) |
| River Grove to Pepinster | 4,209.62 mi (6,774.72 km) |
| River Grove to Peruwelz | 4,127.52 mi (6,642.60 km) |
| River Grove to Perwez | 4,170.10 mi (6,711.12 km) |
| River Grove to Philippeville | 4,175.32 mi (6,719.53 km) |
