| River Falls to Opwijk | 4,168.35 mi (6,708.31 km) |
| River Falls to Ostend | 4,113.30 mi (6,619.72 km) |
| River Falls to Oud-Heverlee | 4,190.80 mi (6,744.45 km) |
| River Falls to Oud-Turnhout | 4,182.16 mi (6,730.53 km) |
| River Falls to Oudenaarde | 4,152.44 mi (6,682.71 km) |
| River Falls to Oudenburg | 4,117.84 mi (6,627.03 km) |
| River Falls to Oupeye | 4,230.22 mi (6,807.89 km) |
| River Falls to Overijse | 4,188.14 mi (6,740.17 km) |
| River Falls to Overpelt | 4,201.35 mi (6,761.41 km) |
| River Falls to Paal | 4,200.13 mi (6,759.45 km) |
| River Falls to Peer | 4,206.08 mi (6,769.03 km) |
| River Falls to Pepinster | 4,242.18 mi (6,827.13 km) |
| River Falls to Peruwelz | 4,165.29 mi (6,703.38 km) |
| River Falls to Perwez | 4,204.59 mi (6,766.64 km) |
| River Falls to Philippeville | 4,212.61 mi (6,779.54 km) |
