| River Ridge to Opwijk | 4,819.67 mi (7,756.51 km) |
| River Ridge to Ostend | 4,762.15 mi (7,663.94 km) |
| River Ridge to Oud-Heverlee | 4,842.66 mi (7,793.51 km) |
| River Ridge to Oud-Turnhout | 4,842.03 mi (7,792.49 km) |
| River Ridge to Oudenaarde | 4,799.37 mi (7,723.83 km) |
| River Ridge to Oudenburg | 4,766.49 mi (7,670.92 km) |
| River Ridge to Oupeye | 4,885.20 mi (7,861.97 km) |
| River Ridge to Overijse | 4,838.68 mi (7,787.10 km) |
| River Ridge to Overpelt | 4,861.96 mi (7,824.57 km) |
| River Ridge to Paal | 4,857.20 mi (7,816.91 km) |
| River Ridge to Peer | 4,865.76 mi (7,830.69 km) |
| River Ridge to Pepinster | 4,896.14 mi (7,879.58 km) |
| River Ridge to Peruwelz | 4,807.56 mi (7,737.03 km) |
| River Ridge to Perwez | 4,854.36 mi (7,812.34 km) |
| River Ridge to Philippeville | 4,855.34 mi (7,813.92 km) |
