| Difficult Run to Bougival | 3,834.77 mi (6,171.47 km) |
| Difficult Run to Bouguenais | 3,715.13 mi (5,978.92 km) |
| Difficult Run to Boulogne-Billancourt | 3,839.82 mi (6,179.59 km) |
| Difficult Run to Boulogne-sur-Mer | 3,766.74 mi (6,061.99 km) |
| Difficult Run to Bourg-de-Peage | 4,066.96 mi (6,545.13 km) |
| Difficult Run to Bourg-en-Bresse | 4,040.15 mi (6,501.99 km) |
| Difficult Run to Bourg-la-Reine | 3,844.39 mi (6,186.94 km) |
| Difficult Run to Bourg-les-Valence | 4,062.85 mi (6,538.52 km) |
| Difficult Run to Bourges | 3,892.72 mi (6,264.73 km) |
| Difficult Run to Bourgoin-Jallieu | 4,060.39 mi (6,534.57 km) |
| Difficult Run to Bressuire | 3,773.32 mi (6,072.57 km) |
| Difficult Run to Brest | 3,561.62 mi (5,731.88 km) |
| Difficult Run to Bretigny-sur-Orge | 3,848.35 mi (6,193.33 km) |
| Difficult Run to Breuillet | 3,843.83 mi (6,186.05 km) |
| Difficult Run to Briancon | 4,140.84 mi (6,664.04 km) |
