- Which is the longest river in Bulgaria?
- A) Maritsa
- B) Danube
- C) Iskar
- D) Struma
- The Danube River flows into which body of water?
- A) Black Sea
- B) Black Sea
- C) Adriatic Sea
- D) Aegean Sea
- Which river is a major tributary of the Danube?
- A) Maritsa
- B) Iskar
- C) Timok
- D) Struma
- The Maritsa River primarily flows through which region of Bulgaria?
- A) Southern Bulgaria
- B) Northern Bulgaria
- C) Eastern Bulgaria
- D) Western Bulgaria
- Which river is known for flowing through the city of Sofia?
- A) Struma
- B) Iskar
- C) Yantra
- D) Maritsa
- The Struma River flows into which sea?
- A) Aegean Sea
- B) Adriatic Sea
- C) Aegean Sea
- D) Mediterranean Sea
- Which river is famous for its scenic gorge?
- A) Danube
- B) Iskar
- C) Maritsa
- D) Yantra
- What is the primary source of the Iskar River?
- A) Rila Mountains
- B) Pirin Mountains
- C) Balkan Mountains
- D) Rhodope Mountains
- Which river forms part of the border between Bulgaria and Romania?
- A) Danube
- B) Maritsa
- C) Struma
- D) Iskar
- The Yantra River is a tributary of which larger river?
- A) Maritsa
- B) Danube
- C) Iskar
- D) Struma
- Which river is known for its numerous hydroelectric plants?
- A) Maritsa
- B) Iskar
- C) Yantra
- D) Danube
- The Maritsa River is significant for which economic activity?
- A) Agriculture
- B) Mining
- C) Fishing
- D) Tourism
- Which river is one of the major rivers in the Rhodope region?
- A) Danube
- B) Yantra
- C) Arda
- D) Iskar
- What is the primary characteristic of the Struma River?
- A) It is navigable all year
- B) It has a high flow during spring
- C) It forms a delta
- D) It is a seasonal river
- The Yantra River is closely associated with which Bulgarian city?
- A) Plovdiv
- B) Veliko Tarnovo
- C) Sofia
- D) Burgas
- Which river passes through the town of Dupnitsa?
- A) Danube
- B) Maritsa
- C) Struma
- D) Iskar
- The Iskar River is important for providing water to which city?
- A) Plovdiv
- B) Sofia
- C) Varna
- D) Burgas
- Which river is known for its rich biodiversity and nature reserves?
- A) Danube
- B) Yantra
- C) Struma
- D) Iskar
- The Mesta River flows primarily through which region?
- A) Northern Bulgaria
- B) Southwestern Bulgaria
- C) Eastern Bulgaria
- D) Central Bulgaria
- Which river is associated with the historic town of Kjustendil?
- A) Iskar
- B) Struma
- C) Bregalnitsa
- D) Danube
- The Danube River serves as a natural boundary between Bulgaria and which country?
- A) Romania
- B) Greece
- C) Serbia
- D) North Macedonia
- Which river is famous for its thermal springs and spa towns along its banks?
- A) Iskar
- B) Maritsa
- C) Struma
- D) Yantra
- What is the main tributary of the Maritsa River?
- A) Iskar
- B) Tundzha
- C) Yantra
- D) Arda
- Which river is the second longest river in Bulgaria after the Danube?
- A) Maritsa
- B) Iskar
- C) Struma
- D) Yantra
- The Yantra River is known for which natural feature?
- A) Extensive delta
- B) Meandering curves
- C) Waterfalls
- D) High altitude
- Which river is the primary source of drinking water for the city of Sofia?
- A) Maritsa
- B) Iskar
- C) Danube
- D) Struma
- The Maritsa River flows through which Bulgarian city known for its historical significance?
- A) Varna
- B) Plovdiv
- C) Ruse
- D) Sofia
- What type of ecosystem is primarily found along the Danube River?
- A) Wetlands
- B) Forests
- C) Mountains
- D) Deserts
- The Mesta River is a tributary of which larger river system?
- A) Danube
- B) Aegean Sea
- C) Adriatic Sea
- D) Black Sea
- Which river is associated with the historic town of Veliko Tarnovo?
- A) Yantra
- B) Iskar
- C) Maritsa
- D) Struma
| River Name | Length (km) | Major Features | Drainage Basin | Notable Locations |
| Danube | 2,860 | Longest river in Bulgaria; forms the border with Romania | Danube Basin | Ruse, Vidin |
| Maritsa | 480 | Important for agriculture; flows through southern Bulgaria | Aegean Sea Basin | Plovdiv, Haskovo |
| Iskar | 368 | Main river flowing through Sofia; significant for hydroelectric power | Danube Basin | Sofia, Iskar Gorge |
| Struma | 290 | Flows into the Aegean Sea; known for scenic landscapes | Aegean Sea Basin | Blagoevgrad, Kjustendil |
| Yantra | 285 | Major tributary of the Danube; known for meandering course | Danube Basin | Veliko Tarnovo |
| Tundzha | 162 | Flows into the Maritsa; important for irrigation | Aegean Sea Basin | Yambol, Elhovo |
| Mesta | 145 | Flows into the Aegean Sea; important for hydroelectric projects | Aegean Sea Basin | Gotse Delchev, Sandanski |
| Osam | 107 | Flows into the Danube; known for its picturesque valley | Danube Basin | Lovech, Troyan |
| Nisava | 80 | Flows into the Morava River; short river located in the west | Morava River Basin | Pernik |