| Difficult Run to Benisa | 4,029.26 mi (6,484.46 km) |
| Difficult Run to Berga | 4,010.36 mi (6,454.04 km) |
| Difficult Run to Berja | 3,941.09 mi (6,342.58 km) |
| Difficult Run to Bermeo | 3,761.47 mi (6,053.50 km) |
| Difficult Run to Berriozar | 3,826.25 mi (6,157.75 km) |
| Difficult Run to Betanzos | 3,508.58 mi (5,646.51 km) |
| Difficult Run to Betera | 3,977.52 mi (6,401.21 km) |
| Difficult Run to Bilbao | 3,756.68 mi (6,045.80 km) |
| Difficult Run to Binefar | 3,946.07 mi (6,350.58 km) |
| Difficult Run to Binisalem | 4,131.25 mi (6,648.60 km) |
| Difficult Run to Blanes | 4,067.02 mi (6,545.24 km) |
| Difficult Run to Boadilla del Monte | 3,790.11 mi (6,099.60 km) |
| Difficult Run to Boiro | 3,490.93 mi (5,618.10 km) |
| Difficult Run to Bolanos de Calatrava | 3,841.72 mi (6,182.65 km) |
| Difficult Run to Bollullos de la Mitacion | 3,768.45 mi (6,064.74 km) |
