| Cascades to Orbetello | 4,418.76 mi (7,111.30 km) |
| Cascades to Oria | 4,771.39 mi (7,678.81 km) |
| Cascades to Oristano | 4,388.72 mi (7,062.96 km) |
| Cascades to Orta Nova | 4,656.03 mi (7,493.15 km) |
| Cascades to Orte | 4,469.58 mi (7,193.09 km) |
| Cascades to Ortona | 4,561.32 mi (7,340.74 km) |
| Cascades to Orvieto | 4,448.42 mi (7,159.04 km) |
| Cascades to Orzinuovi | 4,263.31 mi (6,861.14 km) |
| Cascades to Osimo | 4,480.95 mi (7,211.39 km) |
| Cascades to Ospitaletto | 4,264.21 mi (6,862.59 km) |
| Cascades to Ostuni | 4,760.20 mi (7,660.79 km) |
| Cascades to Ottaviano | 4,619.83 mi (7,434.90 km) |
| Cascades to Ovada | 4,232.59 mi (6,811.69 km) |
| Cascades to Ozieri | 4,384.06 mi (7,055.46 km) |
| Cascades to Paceco | 4,639.44 mi (7,466.46 km) |
