Which major river forms part of Bihar's boundary with Uttar Pradesh?
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This question examines an important Bihar General Knowledge fact: “Which major river forms part of Bihar's boundary with Uttar Pradesh?” The correct answer is Ghaghara. The Ghaghara River forms part of the boundary between Bihar and Uttar Pradesh. Bihar GK covers the state’s history, geography, rivers, districts, wildlife, culture, administration, economy, institutions and notable personalities. The answer Ghaghara matches that requirement directly. Option A (Kosi) does not match the exact person, district, site, institution, event or association required by the question. Option B (Son) does not match the exact person, district, site, institution, event or association required by the question. Option C (Gandak) does not match the exact person, district, site, institution, event or association required by the question.