| Difficult Run to Ayamonte | 3,709.25 mi (5,969.47 km) |
| Difficult Run to Azcoitia | 3,787.20 mi (6,094.92 km) |
| Difficult Run to Azpeitia | 3,789.23 mi (6,098.18 km) |
| Difficult Run to Azuqueca de Henares | 3,814.72 mi (6,139.19 km) |
| Difficult Run to Badajoz | 3,682.37 mi (5,926.20 km) |
| Difficult Run to Badalona | 4,048.50 mi (6,515.43 km) |
| Difficult Run to Baena | 3,849.94 mi (6,195.89 km) |
| Difficult Run to Baeza | 3,880.71 mi (6,245.40 km) |
| Difficult Run to Bailen | 3,863.00 mi (6,216.90 km) |
| Difficult Run to Balaguer | 3,971.37 mi (6,391.30 km) |
| Difficult Run to Banolas | 4,052.22 mi (6,521.41 km) |
| Difficult Run to Baranain | 3,827.47 mi (6,159.71 km) |
| Difficult Run to Barbadanes | 3,546.83 mi (5,708.07 km) |
| Difficult Run to Barbastro | 3,932.54 mi (6,328.81 km) |
| Difficult Run to Barcelona | 4,047.43 mi (6,513.71 km) |
