| Watsonville to Popovo | 6,538.14 mi (10,522.11 km) |
| Watsonville to Provadia | 6,573.83 mi (10,579.56 km) |
| Watsonville to Radnevo | 6,597.24 mi (10,617.24 km) |
| Watsonville to Radomir | 6,513.90 mi (10,483.11 km) |
| Watsonville to Rakitovo | 6,575.20 mi (10,581.76 km) |
| Watsonville to Rakovski | 6,576.46 mi (10,583.79 km) |
| Watsonville to Razgrad | 6,532.68 mi (10,513.33 km) |
| Watsonville to Razlog | 6,566.97 mi (10,568.51 km) |
| Watsonville to Ruse | 6,502.61 mi (10,464.93 km) |
| Watsonville to Samokov | 6,541.15 mi (10,526.97 km) |
| Watsonville to Sandanski | 6,581.95 mi (10,592.63 km) |
| Watsonville to Sevlievo | 6,534.00 mi (10,515.46 km) |
| Watsonville to Shumen | 6,557.13 mi (10,552.68 km) |
| Watsonville to Silistra | 6,511.48 mi (10,479.21 km) |
| Watsonville to Sliven | 6,581.99 mi (10,592.68 km) |
