| Lake Norman of Catawba to Orbetello | 4,718.76 mi (7,594.12 km) |
| Lake Norman of Catawba to Oria | 5,072.59 mi (8,163.54 km) |
| Lake Norman of Catawba to Oristano | 4,683.57 mi (7,537.48 km) |
| Lake Norman of Catawba to Orta Nova | 4,957.10 mi (7,977.69 km) |
| Lake Norman of Catawba to Orte | 4,770.22 mi (7,676.93 km) |
| Lake Norman of Catawba to Ortona | 4,862.86 mi (7,826.02 km) |
| Lake Norman of Catawba to Orvieto | 4,749.23 mi (7,643.15 km) |
| Lake Norman of Catawba to Orzinuovi | 4,566.20 mi (7,348.59 km) |
| Lake Norman of Catawba to Osimo | 4,783.29 mi (7,697.96 km) |
| Lake Norman of Catawba to Ospitaletto | 4,567.32 mi (7,350.40 km) |
| Lake Norman of Catawba to Ostuni | 5,061.62 mi (8,145.89 km) |
| Lake Norman of Catawba to Ottaviano | 4,919.67 mi (7,917.44 km) |
| Lake Norman of Catawba to Ovada | 4,534.06 mi (7,296.87 km) |
| Lake Norman of Catawba to Ozieri | 4,680.23 mi (7,532.09 km) |
| Lake Norman of Catawba to Paceco | 4,934.14 mi (7,940.74 km) |
