| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
401  | Kerelova Kerelova,Kireeva,Керелова | Bulgaria, Smolyan | stream | N 41° 42′ 0'' | E 24° 8′ 0'' |
| 402 | Kaynardzha Kajnardsha,Kajnardzha,Kaynardzha,Ryeka Kainardzha,Кайнарджа | Bulgaria, Burgas | stream | N 42° 24′ 0'' | E 27° 26′ 0'' |
| 403 | Kayadzhik Baniski Lom,Kajadzhik,Kandzhik,Kayadzhik,Каяджик | Bulgaria, Ruse | stream | N 43° 24′ 0'' | E 25° 54′ 0'' |
| 404 | Kavatsite Bukhta Kavatsite,Kavacite,Kavak Bay,Kavatsite,Каваците | Bulgaria, Burgas | bay | N 42° 23′ 35'' | E 27° 42′ 53'' |
| 405 | Katrandzhi Dere Katrandzhi Dere,Катранджи Дере | Bulgaria, Pazardzhik | stream | N 41° 44′ 24'' | E 24° 17′ 45'' |
| 406 | Karlashka Reka Karlashka Reka,Karlushka,Karlushka Reka,Karlŭshka,Karlŭshka Reka,Карлъшка Река | Bulgaria, Pazardzhik | stream | N 41° 56′ 48'' | E 24° 13′ 38'' |
| 407 | Karaul Dere Karaul Dere,Караул Дере | Bulgaria, Smolyan | stream | N 41° 42′ 0'' | E 24° 32′ 0'' |
| 408 | Karamandere Karamandere,Kodzha Dere,Карамандере | Bulgaria, Haskovo | stream | N 41° 50′ 0'' | E 25° 38′ 0'' |
| 409 | Karakaya Deresi Chemose River,Karakaja deresi,Karakaya Deresi,Reka Kararaya Dere,Каракая дереси | Bulgaria, Burgas | stream | N 42° 42′ 0'' | E 27° 32′ 0'' |
| 410 | Karadzhadere Karadzhadere,Karadzhovo Dere,Караджадере | Bulgaria, Smolyan | stream | N 41° 36′ 4'' | E 24° 10′ 57'' |
| 411 | Karabashka Reka Karabashka,Karabashka Reka,Карабашка Река | Bulgaria, Haskovo | stream | N 41° 51′ 39'' | E 26° 29′ 37'' |
| 412 | Karaagachki Zaliv Karaagach,Karaagachki Zaliv,Караагач,Караагачки Залив | Bulgaria, Burgas | bay | N 42° 13′ 46'' | E 27° 46′ 47'' |
| 413 | Kamenitsa Kamenica,Kamenitsa,Kamenka,Каменица | Bulgaria, Lovech | stream | N 43° 14′ 0'' | E 24° 24′ 0'' |
| 414 | Kamchia Kamchia,Kamchija,Kamchiya,Камчия | Bulgaria, Burgas | reservoir(s) | N 42° 52′ 0'' | E 26° 51′ 0'' |
| 415 | Kalnitsa Asmaka,Kalnica,Kalnitsa,Reka Kalnitsa,Калница | Bulgaria, Yambol | stream | N 42° 7′ 0'' | E 26° 31′ 0'' |
| 416 | Yugovska Reka Jugovska Reka,Jugowska Reka,Yugovska Reka,Юговска Река | Bulgaria, Plovdiv | stream | N 41° 55′ 0'' | E 24° 48′ 0'' |
| 417 | Yayladere Jajludere,Yayladere,Yayludere,Yaylya Dere,Yaylŭdere,Яйлудере | Bulgaria, Kardzhali | stream | N 41° 45′ 0'' | E 25° 12′ 0'' |
| 418 | Yasna Polyana Jasna Poljana,Ozero Yasna Polyana,Yasna Polyana,Ясна Поляна | Bulgaria, Burgas | reservoir(s) | N 42° 14′ 41'' | E 27° 35′ 1'' |
| 419 | Yanak Dere Januk Dere,Yanak Dere,Yanuk Dere,Yanŭk Dere,Янук Дере | Bulgaria, Varna | stream | N 43° 26′ 0'' | E 27° 23′ 0'' |
| 420 | Varteshnitsa Varteshnitsa,Vurteshnica,Vurteshnitsa,Vŭrteshnitsa,Warteschniza,Въртешница | Bulgaria, Vratsa | stream | N 43° 23′ 0'' | E 23° 28′ 0'' |
| 421 | Valchi Dol Valchi Dol,Vulchi Dol,Vŭlchi Dol,Вълчи Дол | Bulgaria, Smolyan | stream | N 41° 44′ 0'' | E 24° 41′ 0'' |
| 422 | Vukanshtina Vukanshhina,Vukanshtina,Вуканщина,Въканщина | Bulgaria, Pernik | stream | N 42° 46′ 23'' | E 22° 36′ 41'' |
| 423 | Vrana Ryeka Vrana Dere,Vrana,Wrana,Врана | Bulgaria, Shumen | stream | N 43° 12′ 0'' | E 26° 54′ 0'' |
| 424 | Vlahinska Reka Vlahinska Reka,Vlakhina Reka,Vlakhinska Reka,Влахина Река | Bulgaria, Blagoevgrad | stream | N 41° 44′ 0'' | E 23° 9′ 0'' |
| 425 | Vidima Vidima,Widima,Видима | Bulgaria, Gabrovo | stream | N 42° 59′ 0'' | E 25° 7′ 0'' |
| 426 | Vidbol Vidbol,Widbol,Видбол | Bulgaria, Vidin | stream | N 43° 53′ 52'' | E 22° 50′ 18'' |
| 427 | Reka Varda Reka Varda,Varda,Варда,Река Варда | Bulgaria, Burgas | stream | N 42° 8′ 8'' | E 27° 44′ 21'' |
| 428 | Uzundzhovska Reka Uzundzhoska,Uzundzhovska Reka,Uzunovska Reka,Узуновска Река | Bulgaria, Haskovo | stream | N 41° 56′ 0'' | E 25° 49′ 0'' |
| 429 | Tsaparevska Reka Caparevska Reka,Carevska Reka,Tsaparevska Reka,Цапаревска Река,Царевска Река | Bulgaria, Blagoevgrad | stream | N 41° 38′ 0'' | E 23° 12′ 0'' |
| 430 | Trastikovo Trastikovo,Trustikovo,Trŭstikovo,Тръстиково | Bulgaria, Varna | reservoir(s) | N 43° 8′ 28'' | E 27° 35′ 53'' |
| 431 | Troyanovo Trojanovo,Troyanovo,Vodokhranilishche Troyanovo,Трояново | Bulgaria, Burgas | reservoir(s) | N 42° 34′ 19'' | E 27° 10′ 31'' |
| 432 | Trigradska Reka Trigradska Reka,Триградска Река | Bulgaria, Smolyan | stream | N 41° 37′ 31'' | E 24° 23′ 19'' |
| 433 | Yazovir Toshkov Chark Jazovir Toshkov Chark,Toshkov chark,Yazovir Toshkov Chark,Тошков чарк,Язовир Тошков Чарк | Bulgaria, Pazardzhik | reservoir(s) | N 41° 48′ 35'' | E 24° 9′ 54'' |
| 434 | Tokmakliyska Reka Tokmakliyska,Tokmakliyska Reka,Tokmalijska reka,Токмалийска река | Bulgaria, Haskovo | stream | N 41° 45′ 0'' | E 25° 43′ 0'' |
| 435 | Tiklite Tiklite,Tiklitii,Tiklitye,Тиклите,Тиклитии | Bulgaria, Burgas | stream | N 42° 18′ 4'' | E 27° 38′ 30'' |
| 436 | Tiklinska Reka Tiklinska,Tiklinska Reka,Тиклинска Река | Bulgaria, Kardzhali | stream | N 41° 19′ 0'' | E 25° 19′ 0'' |
| 437 | Tikladere Tikla Dere,Tikladere,Тикла Дере,Тикладере | Bulgaria, Pazardzhik | stream | N 41° 55′ 58'' | E 24° 16′ 10'' |
| 438 | Tikia Tikia,Tikiya,Tiklja,Тикля | Bulgaria, Plovdiv | stream | N 41° 58′ 0'' | E 25° 7′ 0'' |
| 439 | Ticha Beyok' Kamchik',Beyok’ Kamchik’,Ticha,Ticha Reka,Тича | Bulgaria, Shumen | stream | N 43° 11′ 0'' | E 26° 53′ 0'' |
| 440 | Tekirska Reka Tekirska,Tekirska Reka,Tekirska reka,Текирска река | Bulgaria, Haskovo | stream | N 42° 7′ 0'' | E 25° 22′ 0'' |
| 441 | Tekirska Reka Tekirska,Tekirska Reka,Tekirska reka,Текирска река | Bulgaria, Smolyan | stream | N 41° 28′ 0'' | E 24° 44′ 0'' |
| 442 | Tastepe Deresi Ryeka Tas Tepe,Tastepe Deresi,Тастепе Дереси | Bulgaria, Burgas | stream | N 42° 29′ 0'' | E 27° 20′ 0'' |
| 443 | Sveto Blato Ozero Svyato-Blato,Sveto Blato,Свето Блато | Bulgaria, Sliven | marsh(es) | N 42° 46′ 0'' | E 26° 41′ 0'' |
| 444 | Suyusuza Sujusuza,Suyesuza,Suysuza,Suyusuza,Суюсуза | Bulgaria, Pazardzhik | stream | N 41° 46′ 0'' | E 24° 6′ 0'' |
| 445 | Sushichka Reka Sushichka Reka,Sushinska reka,Sushitska Reka,Сушинска река | Bulgaria, Blagoevgrad | stream | N 41° 52′ 0'' | E 23° 8′ 0'' |
| 446 | Suha Reka Khremshtitsa,Suha Reka,Sukha Reka,Суха Река | Bulgaria, Pazardzhik | stream | N 41° 58′ 0'' | E 23° 59′ 0'' |
| 447 | Yazovir Saedinenie Jazovir Suedinenie,Yazovir Saedinenie,Yazovir Suedinenie,Yazovir Sŭedinenie,Язовир Съединение | Bulgaria, Targovishte | reservoir(s) | N 43° 20′ 0'' | E 26° 35′ 0'' |
| 448 | Stolska Reka Smolska,Stolska Reka,Столска Река | Bulgaria, Sofia | stream | N 42° 37′ 0'' | E 24° 1′ 0'' |
| 449 | Stavrova Banka Stavro Banka,Stavrova Banka,Ставрова Банка | Bulgaria, Burgas | shoal(s) | N 42° 31′ 6'' | E 27° 39′ 25'' |
| 450 | Starata Reka Starata,Starata Reka,Starata Reke,Старата Реке | Bulgaria, Haskovo | stream | N 42° 6′ 0'' | E 25° 27′ 0'' |
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