| Harderwijk to Navodari | 1,185.87 mi (1,908.48 km) |
| Harderwijk to Negresti-Oas | 844.89 mi (1,359.71 km) |
| Harderwijk to Nehoiu | 1,052.39 mi (1,693.65 km) |
| Harderwijk to Ocna Mures | 914.83 mi (1,472.28 km) |
| Harderwijk to Odobesti | 1,067.05 mi (1,717.26 km) |
| Harderwijk to Odorheiu Secuiesc | 975.40 mi (1,569.76 km) |
| Harderwijk to Oltenita | 1,117.50 mi (1,798.45 km) |
| Harderwijk to Onesti | 1,036.82 mi (1,668.60 km) |
| Harderwijk to Oradea | 812.16 mi (1,307.04 km) |
| Harderwijk to Orastie | 910.05 mi (1,464.58 km) |
| Harderwijk to Oravita | 886.88 mi (1,427.30 km) |
| Harderwijk to Orsova | 927.48 mi (1,492.63 km) |
| Harderwijk to Otelu Rosu | 891.13 mi (1,434.14 km) |
| Harderwijk to Otopeni | 1,075.76 mi (1,731.26 km) |
| Harderwijk to Ovidiu | 1,185.82 mi (1,908.40 km) |
