| Difficult Run to Borgosatollo | 4,278.27 mi (6,885.21 km) |
| Difficult Run to Borgosesia | 4,186.04 mi (6,736.77 km) |
| Difficult Run to Boscoreale | 4,627.08 mi (7,446.57 km) |
| Difficult Run to Boscotrecase | 4,625.73 mi (7,444.40 km) |
| Difficult Run to Botticino Sera | 4,276.12 mi (6,881.75 km) |
| Difficult Run to Bovalino Marina | 4,801.12 mi (7,726.66 km) |
| Difficult Run to Boves | 4,198.57 mi (6,756.95 km) |
| Difficult Run to Boville Ernica | 4,549.97 mi (7,322.47 km) |
| Difficult Run to Bovisio Masciago | 4,227.11 mi (6,802.87 km) |
| Difficult Run to Bovolone | 4,323.84 mi (6,958.54 km) |
| Difficult Run to Bra | 4,200.07 mi (6,759.36 km) |
| Difficult Run to Bracciano | 4,477.37 mi (7,205.64 km) |
| Difficult Run to Brandizzo | 4,184.50 mi (6,734.30 km) |
| Difficult Run to Breganze | 4,327.26 mi (6,964.05 km) |
| Difficult Run to Brembate | 4,244.77 mi (6,831.29 km) |
