| Country: | TUR |
| Type: | D |
| Route: | 100 |
| Map: | D 100 harita.svg |
| Length Km: | 1788 |
| Direction A: | West |
| Terminus A: | at the Bulgarian border near Kapıkule |
| Direction B: | East |
| Terminus B: | at the Iranian border near Gürbulak |
D.100 is a west-to-east state road in Turkey. It starts at Kapıkule, the Bulgarian border check point, and ends in Gürbulak, the Iranian border check point.[1] Running all the way from west to east, it crosses most of the north-to-south state roads, including the D.650, D.750, D.850 and D.950.
| Province | Location | Distance from Kapıkule (km) | Distance from Kapıkule (mile) | Distance from Gürbulak (km) | Distance from Gürbulak (mile) |
|---|---|---|---|---|---|
| Kapıkule (Bulgarian border) Maritsa motorway | 0 | 0 | 1788 | 1111 | |
| Edirne | 23 | 14 | 1765 | 1097 | |
| Kırklareli Province | Lüleburgaz | 95 | 59 | 1693 | 1052 |
| Tekirdağ Province | Çorlu | 142 | 88 | 1646 | 1023 |
| Istanbul Province | Istanbul[2] | 253 | 157 | 1535 | 954 |
| Gebze | 313 | 194 | 1475 | 917 | |
| İzmit | 364 | 226 | 1426 | 884 | |
| Sakarya Province | Adapazarı | 401 | 249 | 1387 | 862 |
| Bolu | 515 | 320 | 1273 | 791 | |
| Gerede | 568 | 353 | 1220 | 758 | |
| Çankırı Province | Ilgaz | 705 | 438 | 1083 | 673 |
| Çorum Province | Osmancık | 815 | 506 | 973 | 605 |
| Merzifon | 873 | 546 | 910 | 565 | |
| Amasya | 924 | 574 | 864 | 536 | |
| Tokat Province | Niksar | 1030 | 641 | 758 | 471 |
| Sivas Province | Koyulhisar (junction) | 1117 | 694 | 671 | 417 |
| Erzincan Province | Erzincan | 1288 | 800 | 500 | 311 |
| Aşkale | 1423 | 884 | 365 | 227 | |
| Erzurum | 1477 | 918 | 311 | 193 | |
| Horasan | 1561 | 970 | 227 | 141 | |
| Ağrı Province | |||||
| Ağrı | 1659 | 1030 | 129 | 80 | |
| Doğubayazıt | 1751 | 1089 | 35 | 22 | |
| Gürbulak (Iranian border) | 1788 | 1111 | 0 | 0 |
See also: Swan Aviation Sikorsky S-76 Crash. On March 10, 2017, a Sikorsky S-76 helicopter owned by Swan Aviation hit the antenna of the Endem TV Tower in heavy fog and crashed onto the State Road D100. All seven people on board were killed.