| Cascades to Opwijk | 3,860.45 mi (6,212.79 km) |
| Cascades to Ostend | 3,802.86 mi (6,120.10 km) |
| Cascades to Oud-Heverlee | 3,883.43 mi (6,249.78 km) |
| Cascades to Oud-Turnhout | 3,883.54 mi (6,249.96 km) |
| Cascades to Oudenaarde | 3,839.82 mi (6,179.60 km) |
| Cascades to Oudenburg | 3,807.16 mi (6,127.04 km) |
| Cascades to Oupeye | 3,926.14 mi (6,318.52 km) |
| Cascades to Overijse | 3,879.35 mi (6,243.21 km) |
| Cascades to Overpelt | 3,903.50 mi (6,282.07 km) |
| Cascades to Paal | 3,898.41 mi (6,273.88 km) |
| Cascades to Peer | 3,907.19 mi (6,288.02 km) |
| Cascades to Pepinster | 3,936.97 mi (6,335.94 km) |
| Cascades to Peruwelz | 3,847.65 mi (6,192.20 km) |
| Cascades to Perwez | 3,894.93 mi (6,268.28 km) |
| Cascades to Philippeville | 3,895.37 mi (6,269.00 km) |
