| Difficult Run to Boekel | 3,908.49 mi (6,290.11 km) |
| Difficult Run to Bolsward | 3,865.71 mi (6,221.26 km) |
| Difficult Run to Borger | 3,918.01 mi (6,305.43 km) |
| Difficult Run to Borne | 3,932.74 mi (6,329.14 km) |
| Difficult Run to Boskoop | 3,856.22 mi (6,205.98 km) |
| Difficult Run to Boxmeer | 3,918.42 mi (6,306.09 km) |
| Difficult Run to Boxtel | 3,895.67 mi (6,269.47 km) |
| Difficult Run to Breda | 3,873.31 mi (6,233.49 km) |
| Difficult Run to Breukelen | 3,867.46 mi (6,224.08 km) |
| Difficult Run to Brielle | 3,841.21 mi (6,181.83 km) |
| Difficult Run to Bronkhorst | 3,916.25 mi (6,302.60 km) |
| Difficult Run to Brummen | 3,914.94 mi (6,300.49 km) |
| Difficult Run to Brunssum | 3,937.68 mi (6,337.08 km) |
| Difficult Run to Bunnik | 3,879.69 mi (6,243.77 km) |
| Difficult Run to Burgum | 3,880.38 mi (6,244.86 km) |
