| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
501  | Yégé Oganga Yege Oganga,Yégé Oganga | Chad, Ennedi-Ouest | locality | N 17° 18′ 32'' | E 21° 36′ 8'' |
502  | Yaouada Lawada,Yaouada,Yaouda,Yawada | Chad, Wadi Fira | populated place | N 14° 39′ 25'' | E 21° 8′ 23'' |
| 503 | Ouaya-Ouaya Ouaya,Ouaya-Ouaya,Waya Waya | Chad, Wadi Fira | populated place | N 14° 54′ 38'' | E 21° 39′ 36'' |
| 504 | Toutournan | Chad, Ouadaï | locality | N 13° 55′ 22'' | E 21° 16′ 2'' |
| 505 | Tourkou | Chad, Région du Borkou-Ennedi-Tibesti | area | N 17° 35′ 0'' | E 22° 9′ 0'' |
| 506 | Tordou Emi Tordou Emi | Chad, Ennedi-Ouest | area | N 19° 18′ 31'' | E 20° 9′ 32'' |
507  | Hadjer Tordan Djebel Tordame,Hadjer Tordan,Hadjer Tordane,Hagar Tordane | Chad, Ennedi-Est | hill | N 15° 52′ 0'' | E 23° 48′ 0'' |
| 508 | Hadjer Tonbola Djebel Tombola,Hadjer Tombola,Hadjer Tonbola | Chad, Sila | hill | N 12° 28′ 0'' | E 22° 3′ 0'' |
| 509 | Tirguil Tirgil,Tirguil,Tirguin | Chad, Salamat | populated place | N 10° 4′ 36'' | E 21° 10′ 46'' |
| 510 | Tiney Tinaye,Tiney,Tiney Doungous | Chad, Sila | populated place | N 12° 43′ 0'' | E 20° 45′ 0'' |
| 511 | Téssouel Tesoual,Tessouel,Teswel,Tésoual,Téssouel | Chad, Wadi Fira | populated place | N 14° 20′ 44'' | E 21° 27′ 41'' |
| 512 | Terbèli Terbeli,Terbelli,Terbèli | Chad, Ennedi-Ouest | plateau | N 18° 51′ 22'' | E 20° 48′ 50'' |
| 513 | Gara Téléhat Gara Talehat,Gara Telehat,Gara Téléhat | Chad, Ennedi-Ouest | hills | N 20° 20′ 0'' | E 21° 36′ 0'' |
| 514 | Téi Trama Tei Trama,Téi Trama | Chad, Ennedi-Ouest | area | N 19° 7′ 19'' | E 20° 9′ 15'' |
| 515 | Téï Agoza Tei Agoza,Téï Agoza | Chad, Ennedi-Est | area | N 16° 21′ 13'' | E 23° 43′ 14'' |
| 516 | Téhimé Hadjer Tehime,Hadjer Téhimé,Tehime,Téhimé | Chad, Ennedi-Ouest | hill | N 16° 35′ 15'' | E 21° 51′ 11'' |
| 517 | Hadjer Tégroba Hadjer Tegroba,Hadjer Tégroba,Hagar Tegroba | Chad, Ennedi-Est | hills | N 16° 56′ 28'' | E 23° 18′ 5'' |
| 518 | Téguéré Derta Tegere Derta,Teguere,Teguere Derta,Tegueré,Téguéré Derta,Tégéré Derta | Chad, Ouadaï | populated place | N 13° 17′ 21'' | E 21° 55′ 19'' |
| 519 | Tébi Tebi,Tébi | Chad, Ennedi-Ouest | locality | N 17° 54′ 55'' | E 21° 56′ 59'' |
| 520 | Taouilé Rigil Tawie,Rigil Tawié,Taouile,Taouilé,Tawile,Tawilé | Chad, Ouadaï | populated place | N 14° 6′ 5'' | E 21° 24′ 14'' |
| 521 | Tatabak | Chad, Salamat | area | N 10° 28′ 58'' | E 21° 26′ 25'' |
| 522 | Tara Habilé Tara,Tara Habile,Tara Habilé,Taro Habile | Chad, Ouadaï | populated place | N 13° 27′ 25'' | E 21° 21′ 3'' |
| 523 | Tanguéné Tangene,Tanguene,Tanguéné,Tangéné,Timguene | Chad, Ouadaï | populated place | N 13° 58′ 29'' | E 20° 34′ 56'' |
| 524 | Tamloga | Chad, Région du Borkou-Ennedi-Tibesti | area | N 17° 8′ 0'' | E 21° 44′ 0'' |
| 525 | Talha Talha,Tulayhah,Ţulayḩah | Chad, Ennedi-Ouest | populated place | N 20° 13′ 0'' | E 21° 17′ 0'' |
| 526 | Gara Talehat Gara Talehat,Qarat Tulayhat,Qārat Ţulayḩāt | Chad, Ennedi-Ouest | hills | N 20° 10′ 58'' | E 21° 37′ 5'' |
| 527 | Talama | Chad, Borkou | area | N 15° 50′ 0'' | E 20° 25′ 0'' |
| 528 | Tala Amossri Tala Amossri | Chad, Ennedi-Ouest | area | N 19° 25′ 33'' | E 21° 6′ 7'' |
| 529 | Tagoulicha Tagoulicha | Chad, Ennedi-Est | area | N 18° 32′ 20'' | E 23° 43′ 26'' |
| 530 | Tabinaka Tabinaka | Chad, Ennedi-Ouest | area | N 17° 6′ 48'' | E 21° 19′ 11'' |
| 531 | Hadjer Sourbaral Djebel Sorbakal,Hadjer Sourbaral,Massif de Sirbakal | Chad, Ouadaï | mountain | N 13° 11′ 30'' | E 21° 39′ 58'' |
| 532 | Hadjer Sila Hadjer Sila,Hadjer Silla,hjr syla,حجر سيلا | Chad, Sila | hill | N 12° 2′ 0'' | E 22° 27′ 0'' |
| 533 | Sifair Djebel Sifeia,Djebel Siféïa,Jebel Sifeia,Sifair | Chad, Salamat | mountain | N 11° 37′ 1'' | E 21° 46′ 30'' |
| 534 | Séger | Chad, Ennedi-Ouest | area | N 19° 27′ 0'' | E 20° 55′ 0'' |
| 535 | Rogorokro Rogorokro,Rokrog,Rokrogo | Chad, Ouadaï | populated place | N 13° 0′ 19'' | E 21° 10′ 12'' |
| 536 | Rife | Chad, Ouadaï | locality | N 13° 53′ 31'' | E 21° 8′ 20'' |
537  | Ouadi Ito Ouadi Ito,Ouadi Oure Ito,Oued Ito,wad aytw,wady awry aytw,wady aytw,واد إيتو,وادي أوري إيتو,وادي إيت... | Chad, Ennedi-Est | wadi | N 16° 19′ 21'' | E 22° 27′ 30'' |
| 538 | Ouori | Chad, Borkou | area | N 17° 48′ 0'' | E 20° 17′ 0'' |
| 539 | Wādī Umm Hājar Ouadi Oum Hadjer,Oued Oum Hadiar,Oued Oum-Hadjer,Wadi Oum Hadjer,Wadi Umm Hadschar,Wadi Umm Hagar,Wa... | Chad, Borkou | wadi | N 16° 50′ 33'' | E 20° 8′ 58'' |
| 540 | Hadjer Ouir Kiloïgué Hadjer Ouir Kiloig,Hadjer Ouir Kiloige,Hadjer Ouir Kiloigue,Hadjer Ouir Kiloïg,Hadjer Ouir Kiloïgué,... | Chad, Ouadaï | hill | N 13° 44′ 9'' | E 22° 6′ 16'' |
| 541 | Oudémanga Oudemanga,Oudémanga | Chad, Ennedi-Est | area | N 19° 1′ 12'' | E 23° 34′ 36'' |
| 542 | Ouara Ouara,Ouarra,Uara,awara,wara,Уара,اوارا,وارا | Chad, Ouadaï | populated place | N 14° 14′ 7'' | E 20° 40′ 26'' |
| 543 | Ouagif Ouagif,Ouaguif | Chad, Ennedi-Ouest | hill | N 16° 49′ 48'' | E 21° 20′ 14'' |
| 544 | Ouachi Kiroma Ouachi Kiroma | Chad, Borkou | area | N 19° 22′ 59'' | E 20° 6′ 7'' |
| 545 | Hadjer Oroua Hadjer Eroua,Hadjer Oroua,Hagar Eroua | Chad, Wadi Fira | hill | N 15° 35′ 0'' | E 22° 31′ 0'' |
| 546 | Hadjer Oro Djebel Oro,Hadjer Oro,Hagar Oro | Chad, Sila | mountain | N 11° 58′ 3'' | E 22° 30′ 24'' |
| 547 | Okohé Okohe,Okohé | Chad, Ennedi-Ouest | area | N 17° 25′ 18'' | E 21° 13′ 15'' |
| 548 | Oarda Goulji Garda-Goulji,Oarda Goulji | Chad, Ennedi-Ouest | escarpment | N 18° 59′ 55'' | E 20° 42′ 32'' |
| 549 | Oagono | Chad, Ouadaï | locality | N 13° 53′ 26'' | E 21° 19′ 59'' |
| 550 | Niomelki | Chad, Sila | lake | N 11° 41′ 4'' | E 21° 4′ 17'' |
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