Which river forms the boundary between Bihar and Jharkhand?
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This question examines an important Bihar General Knowledge fact: “Which river forms the boundary between Bihar and Jharkhand?” The correct answer is Son. The Son river (Sone river) forms a significant part of the natural boundary between Bihar and Jharkhand. The Son originates from the Amarkantak plateau in Madhya Pradesh and flows northeast before joining the Ganga near Patna. It flows through Jharkhand and Bihar, and its course marks the boundary in certain stretches between the two states. The Ganga is the principal river of Bihar but flows through the middle of Bihar from west to east and does not form a boundary with Jharkhand.