| Gourock to Ondokuzmayis | 2,073.31 mi (3,336.67 km) |
| Gourock to Ordu | 2,165.96 mi (3,485.77 km) |
| Gourock to Ortahisar | 2,167.57 mi (3,488.36 km) |
| Gourock to Ortakent | 1,975.41 mi (3,179.12 km) |
| Gourock to Ortaklar | 1,940.66 mi (3,123.20 km) |
| Gourock to Ortakoy | 2,131.15 mi (3,429.76 km) |
| Gourock to Ortakoy | 2,100.51 mi (3,380.45 km) |
| Gourock to Osmaneli | 1,902.82 mi (3,062.29 km) |
| Gourock to Osmaniye | 2,297.30 mi (3,697.15 km) |
| Gourock to Ozdere | 1,920.64 mi (3,090.96 km) |
| Gourock to Palu | 2,354.40 mi (3,789.03 km) |
| Gourock to Pamukkale | 1,995.44 mi (3,211.35 km) |
| Gourock to Patnos | 2,439.83 mi (3,926.52 km) |
| Gourock to Pazar | 2,140.89 mi (3,445.44 km) |
| Gourock to Pazarcik | 2,315.24 mi (3,726.02 km) |
