| English racetrack town |
| British racetrack site |
| Boundary Waters' vessels |
| (In astronomy) notional boundary of a black hole — viz not hereon (anag) |
| Horse racetrack part |
| Common property boundary |
| Racetrack barrier |
| Circuits of a racetrack |
| Tricky racetrack curves |
| It may be a boundary between neighboring countries ... or what each set of circles depicts? |
| Boundary |
| Boundary marker on a musical staff |
| Advantageous racetrack position |
| Outer boundary |
| Racetrack town |
| Ancient boundary between Romans and Carthaginians |
| Racetrack circuits |
| Certain racetrack wager |
| Imaginary boundary for the South Frigid Zone |
| Boundary imposed on Poland in 1944 |
| Abbr. on a city boundary sign |
| Racetrack position |
| Boundary marker |
| Air-mass boundary |
| ___ line (court boundary) |
| Country's boundary |
| Racetrack boundary |
| Racetrack sound |
| Racetrack part |
| Attack, as across a boundary |