| Zones | City | Latitude (˚N) | Longitude (˚E) | Elevation (m) |
| Saharan zone | Faya-Largeau | 17.55 | 19.7 | 233 |
| Abeche | 13.51 | 20.51 | 545 | |
| N’Djamena | 12.8 | 15.2 | 294 | |
| Sahelian zone | Ati | 13.13 | 18.19 | 334 |
| Bokoro | 12.23 | 17.3 | 300 | |
| Mongo | 12.11 | 18.41 | 430 | |
| Moussoro | 13.39 | 16.3 | 301 | |
| Am-timan | 11.2 | 20.17 | 432 | |
| Bongor | 10.17 | 16.22 | 328 | |
| Sudanese zone | Moundou | 8.37 | 16.4 | 420 |
| Pala | 9.22 | 14.55 | 420 | |
| Sarh | 9.9 | 18.23 | 364 |