Q. On which river is the historic Koilwar (Abdul Bari) Bridge in Bihar located?
Answer: Sone
Notes: Koilwar (Abdul Bari) Bridge spans the Sone river near Arrah, connecting it to Patna. Built in 1862, it is India's oldest operational railway bridge and was once the country’s longest river bridge.
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📌 Question Number: 182 in 4. Geography & Environment of Bihar in the above course in App.