Consider the following pairs : River - Flows into 1. Mekong - Andaman Sea 2. Thames - Irish Sea 3. Volga - Caspian Sea 4. Zambezi - Indian Ocean Which of the pairs given above is/are correctly matched ?

1. Pair 1: Mekong River flows through Southeast Asia and empties into the South China Sea, not the Andaman Sea. (Incorrectly matched) 2. Pair 2: Thames River flows through southern England and empties into the North Sea, not the Irish Sea. (Incorrectly matched) 3. Pair 3: Volga River, the longest river in Europe, flows through central Russia and drains into the Caspian Sea. (Correctly matched) 4. Pair 4: Zambezi River flows through southern Africa and empties into the Indian Ocean through the Mozambique Channel. (Correctly matched) 5. Therefore, only pairs 3 and 4 are correctly matched.