WThe Aheloy River or Achelous is a river in eastern Bulgaria. It originates in the Aytos-Karnobat mountain, 1.5 kilometres from Dryankovets, and flows directly into the Black Sea south of the village of Aheloy. The Aheloy River has a length of 39.9 kilometres and has an irrigation reservoir, the Aheloy Reservoir, built along its flow. The river's drainage basin covers 141 square kilometres and its average discharge is 0.7 cubic metres per second.
WThe Cogâlnic is a 243 km river in Moldova and south-western Ukraine.
WThe Dagomys is a river in the Caucasus that flows into the Black Sea. It has two tributaries; on the left is the Western Dagomys, and on the right is the Eastern Dagomys. The river flows through the City of Sochi.
WThe Dyavolska reka is a river in Burgas Province, southeastern Bulgaria. It originates in the Strandzha mountains, runs near the coastal town of Primorsko, and flows into the Black Sea. In its middle course, it forms a marshy area known as Dyavolsko blato.
WThe Kamchiya is a 191-kilometre (119 mi) river in eastern Bulgaria, the longest river on the Balkan Peninsula to flow directly into the Black Sea. It starts from the confluence of two rivers springing from Eastern Stara Planina, Golyama Kamchiya and Luda Kamchiya, flows eastward to the Black Sea and empties into it 25 km south of Varna, in the Resort of Kamchiya.
WThe Karaagach is a small river in south-eastern Bulgaria which flows to the south of the town of Kiten on the territory of the Tsarevo Municipality. It forms a deep estuary on the coast of the Black Sea which is 11–14 metres (36–46 ft) deep. The river is rich in rare fish species and has varied flora. Karaagach is 15 kilometres (9.3 mi) long.
WKintrishi is a river in the Autonomous Republic of Adjara in southwestern Georgia.
WThe Matsesta is a river in Krasnodar Krai, Russia, that flows into the Black Sea. The river rises in the southern ranges of the Alek mountains at an elevation of 900 metres (3,000 ft) above sea level and flows through the Khostinsky City District of the city of Sochi and into the Black Sea. It is 18 kilometres (11 mi) long, and has a drainage basin of 67.5 square kilometres (26.1 sq mi). The highest point in the river's basin is 1,003 metres (3,291 ft) above sea level. The river has numerous tributaries, the largest of which are the Tsanyk and Zmeyka.
WMzymta is a river in Western Caucasus, Russia, flowing through Mostovsky District and the city of Sochi of Krasnodar Krai, Russia. Mzymta is the largest river in Russia emptying into the Black Sea. It is 89 kilometres (55 mi) long with a watershed of 885 square kilometres (342 sq mi). All the venues of the 2014 Winter Olympics were in the Mzymta Valley.
WThe Provadiya and is a river in northeastern Bulgaria. It is 119 km long and has a drainage basin of 2,132 km². The river takes its source from close to the village of Dobri Voynikovo in Shumen Province, flowing southeast and then making a sharp turn northeast to empty into Lake Devnya at Devnya. It is part of the Black Sea drainage area, as Lake Devnya is connected to Lake Varna and it to the Black Sea.
WThe Rezovo is a river in the extreme southeast of Bulgaria and northernmost part of European Turkey. The river is situated in Bulgaria's Strandzha Nature Park.
WThe Ropotamo is a river in south-eastern Bulgaria. It takes its source from the Bosna Ridge in the Strandzha Mountains, running for 48.5 km to empty into the Black Sea near Cape Saint Demetrius between Dyuni and Primorsko.
WThe Shakhe, also known as the Golovinka is a river in Khostinsky and Lazarevsky City Districts of the city of Sochi, Krasnodar Krai in Russia. It flows down the sloped of the Western Caucasus to the Black Sea. It is 59 kilometres (37 mi) long, and the area of its basin 553 square kilometres (214 sq mi). Its main tributary is the Bzych (left). The Shakhe is the second longest river of Sochi, next to the Mzymta.
WThe Sochi is a river in the city of Sochi in Krasnodar Krai, Russia. It is 45 kilometres (28 mi) long, and the area of its basin 296 square kilometres (114 sq mi).
WThe Southern Bug, also called Southern Buh, and sometimes Boh River, is a navigable river located in Ukraine. It is the second-longest river in Ukraine.
WSredetska reka is a river in eastern Bulgaria. It is 69 km long with a catchment area of 985 km2. It empties into the Black Sea through Lake Mandrensko near Burgas.
WThe Veleka is a river in the very southeast of Bulgaria, as well as the very northeast of European Turkey. It is 147 km long, of which 108 km in Bulgaria and 25 km in Turkey, and takes it sources from a number of Karst springs in the Turkish part of the Strandzha (İstranca) mountain to flow into the Black Sea at the Bulgarian village of Sinemorets. Veleka is situated in Strandzha Nature Park.
WThe Velykyi Kuyalnik, or Bolshoy Kuyalnik is a river in Podilsk, Ananyiv, Shyriaieve, and Ivanivka Raions of Odessa Oblast in Ukraine. Its mouth is the Kuyalnik Estuary of the Black Sea. The length of the river is 150 kilometres (93 mi), and the area of its drainage basin is 1,860 square kilometres (720 sq mi). The urban-type settlements of Shyriaieve and Ivanivka are located on the banks of the Velykyi Kuyalnik.