| Difficult Run to Bicaz | 4,865.81 mi (7,830.76 km) |
| Difficult Run to Bistrita | 4,796.17 mi (7,718.69 km) |
| Difficult Run to Blaj | 4,812.03 mi (7,744.21 km) |
| Difficult Run to Bocsa | 4,756.76 mi (7,655.27 km) |
| Difficult Run to Boldesti-Scaeni | 4,941.29 mi (7,952.23 km) |
| Difficult Run to Bolintin Vale | 4,954.85 mi (7,974.06 km) |
| Difficult Run to Borsa | 4,781.42 mi (7,694.96 km) |
| Difficult Run to Botosani | 4,853.04 mi (7,810.21 km) |
| Difficult Run to Brad | 4,769.87 mi (7,676.37 km) |
| Difficult Run to Bragadiru | 4,966.61 mi (7,992.99 km) |
| Difficult Run to Braila | 5,005.68 mi (8,055.87 km) |
| Difficult Run to Brasov | 4,898.85 mi (7,883.94 km) |
| Difficult Run to Breaza | 4,920.42 mi (7,918.66 km) |
| Difficult Run to Bucharest | 4,969.10 mi (7,996.99 km) |
| Difficult Run to Buftea | 4,957.32 mi (7,978.03 km) |
