| Gronau to Popovo | 1,075.85 mi (1,731.42 km) |
| Gronau to Provadia | 1,128.98 mi (1,816.91 km) |
| Gronau to Radnevo | 1,114.11 mi (1,792.99 km) |
| Gronau to Radomir | 995.86 mi (1,602.67 km) |
| Gronau to Rakitovo | 1,063.87 mi (1,712.13 km) |
| Gronau to Rakovski | 1,079.69 mi (1,737.60 km) |
| Gronau to Razgrad | 1,078.28 mi (1,735.32 km) |
| Gronau to Razlog | 1,047.79 mi (1,686.25 km) |
| Gronau to Ruse | 1,043.89 mi (1,679.98 km) |
| Gronau to Samokov | 1,027.57 mi (1,653.72 km) |
| Gronau to Sandanski | 1,058.00 mi (1,702.69 km) |
| Gronau to Sevlievo | 1,049.32 mi (1,688.72 km) |
| Gronau to Shumen | 1,105.40 mi (1,778.96 km) |
| Gronau to Silistra | 1,081.29 mi (1,740.18 km) |
| Gronau to Sliven | 1,110.54 mi (1,787.24 km) |
