Which river joins the Ganga at Allahabad (Prayagraj)?
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This question examines an important river-or-lake fact: “Which river joins the Ganga at Allahabad (Prayagraj)?” The correct answer is Yamuna. The Yamuna River joins the Ganga at Triveni Sangam in Allahabad (now Prayagraj). The legendary Saraswati River is also said to join here underground, making it a Triveni (three rivers) confluence. A river system includes its source, tributaries, distributaries, drainage basin, watershed, channel, floodplain, delta or estuary and final outlet. River behaviour depends on relief, geology, rainfall, snowmelt, sediment load, vegetation and human intervention. Examination questions often confuse a river’s source with its mouth, a left-bank tributary with a right-bank tributary, or a natural lake with a reservoir.