| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Tvŭrdica | city | Sliven | Bulgaria | 42.70 | 25.90 | 1669 | 2925 |
| Tvŭrdintsi | city | Shumen | Bulgaria | 43.38 | 26.78 | 1227 | 3659 |
| Tvŭrditsa | city | Dobrich | Bulgaria | 43.62 | 28.45 | 213 | 2414 |
| Tvŭrditsa | city | Burgas | Bulgaria | 42.41 | 27.46 | 170 | 16223 |