| Difficult Run to Argentona | 4,052.61 mi (6,522.04 km) |
| Difficult Run to Arico el Nuevo | 3,516.34 mi (5,659.00 km) |
| Difficult Run to Armilla | 3,898.62 mi (6,274.23 km) |
| Difficult Run to Arnedo | 3,823.47 mi (6,153.29 km) |
| Difficult Run to Arona | 3,509.60 mi (5,648.15 km) |
| Difficult Run to Arrecife | 3,647.37 mi (5,869.87 km) |
| Difficult Run to Arrigorriaga | 3,759.74 mi (6,050.71 km) |
| Difficult Run to Arroyomolinos | 3,792.88 mi (6,104.05 km) |
| Difficult Run to Arteijo | 3,493.77 mi (5,622.69 km) |
| Difficult Run to Arucas | 3,570.70 mi (5,746.49 km) |
| Difficult Run to Aspe | 4,001.07 mi (6,439.10 km) |
| Difficult Run to Astorga | 3,630.40 mi (5,842.56 km) |
| Difficult Run to Atarfe | 3,892.78 mi (6,264.82 km) |
| Difficult Run to Avila | 3,744.50 mi (6,026.19 km) |
| Difficult Run to Aviles | 3,609.98 mi (5,809.70 km) |
