| Geraardsbergen to Oria | 969.31 mi (1,559.96 km) |
| Geraardsbergen to Oristano | 784.30 mi (1,262.21 km) |
| Geraardsbergen to Orta Nova | 862.55 mi (1,388.14 km) |
| Geraardsbergen to Orte | 701.05 mi (1,128.22 km) |
| Geraardsbergen to Ortona | 765.69 mi (1,232.27 km) |
| Geraardsbergen to Orvieto | 678.49 mi (1,091.92 km) |
| Geraardsbergen to Orzinuovi | 464.32 mi (747.25 km) |
| Geraardsbergen to Osimo | 675.38 mi (1,086.92 km) |
| Geraardsbergen to Ospitaletto | 459.53 mi (739.54 km) |
| Geraardsbergen to Ostuni | 955.08 mi (1,537.06 km) |
| Geraardsbergen to Ottaviano | 852.95 mi (1,372.69 km) |
| Geraardsbergen to Ovada | 477.91 mi (769.13 km) |
| Geraardsbergen to Ozieri | 745.46 mi (1,199.69 km) |
| Geraardsbergen to Paceco | 980.25 mi (1,577.56 km) |
| Geraardsbergen to Pachino | 1,118.21 mi (1,799.59 km) |
