| Isselburg to Popovo | 1,086.37 mi (1,748.34 km) |
| Isselburg to Provadia | 1,140.43 mi (1,835.34 km) |
| Isselburg to Radnevo | 1,122.58 mi (1,806.62 km) |
| Isselburg to Radomir | 1,001.12 mi (1,611.14 km) |
| Isselburg to Rakitovo | 1,069.66 mi (1,721.45 km) |
| Isselburg to Rakovski | 1,087.04 mi (1,749.42 km) |
| Isselburg to Razgrad | 1,089.39 mi (1,753.21 km) |
| Isselburg to Razlog | 1,052.63 mi (1,694.04 km) |
| Isselburg to Ruse | 1,054.92 mi (1,697.74 km) |
| Isselburg to Samokov | 1,033.27 mi (1,662.88 km) |
| Isselburg to Sandanski | 1,062.10 mi (1,709.29 km) |
| Isselburg to Sevlievo | 1,058.06 mi (1,702.79 km) |
| Isselburg to Shumen | 1,116.52 mi (1,796.86 km) |
| Isselburg to Silistra | 1,094.13 mi (1,760.83 km) |
| Isselburg to Sliven | 1,120.06 mi (1,802.56 km) |
