| Boucau to Castelli Calepio | 578.48 mi (930.97 km) |
| Boucau to Castelnovo ne' Monti | 593.80 mi (955.63 km) |
| Boucau to Castelnuovo Berardenga | 651.24 mi (1,048.07 km) |
| Boucau to Castelnuovo di Porto | 714.35 mi (1,149.64 km) |
| Boucau to Castelnuovo di Verona | 617.66 mi (994.03 km) |
| Boucau to Castelnuovo Rangone | 620.36 mi (998.37 km) |
| Boucau to Castelvetrano | 849.22 mi (1,366.69 km) |
| Boucau to Castelvetro di Modena | 621.06 mi (999.50 km) |
| Boucau to Castenaso | 646.72 mi (1,040.80 km) |
| Boucau to Castenedolo | 595.50 mi (958.37 km) |
| Boucau to Castiglion Fiorentino | 671.99 mi (1,081.47 km) |
| Boucau to Castiglione del Lago | 679.99 mi (1,094.34 km) |
| Boucau to Castiglione delle Stiviere | 604.53 mi (972.90 km) |
| Boucau to Castrolibero | 959.19 mi (1,543.67 km) |
| Boucau to Castrovillari | 946.02 mi (1,522.47 km) |
