| Gourock to Nasaud | 1,375.63 mi (2,213.86 km) |
| Gourock to Navodari | 1,661.68 mi (2,674.21 km) |
| Gourock to Negresti-Oas | 1,314.76 mi (2,115.91 km) |
| Gourock to Nehoiu | 1,529.32 mi (2,461.20 km) |
| Gourock to Ocna Mures | 1,392.93 mi (2,241.70 km) |
| Gourock to Odobesti | 1,539.74 mi (2,477.98 km) |
| Gourock to Odorheiu Secuiesc | 1,449.98 mi (2,333.51 km) |
| Gourock to Oltenita | 1,598.93 mi (2,573.23 km) |
| Gourock to Onesti | 1,507.47 mi (2,426.03 km) |
| Gourock to Oradea | 1,291.72 mi (2,078.83 km) |
| Gourock to Orastie | 1,392.28 mi (2,240.65 km) |
| Gourock to Oravita | 1,374.33 mi (2,211.77 km) |
| Gourock to Orsova | 1,414.65 mi (2,276.65 km) |
| Gourock to Otelu Rosu | 1,376.28 mi (2,214.92 km) |
| Gourock to Otopeni | 1,556.72 mi (2,505.30 km) |
