Which river flows through the Assam Valley and passes Guwahati?
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This question examines an important river-or-lake fact: “Which river is called the 'Lifeline of Assam'?” The correct answer is Brahmaputra. The Brahmaputra River is called the 'Lifeline of Assam' because it sustains the agriculture, economy, transportation, and ecology of the state. Assam's entire geography, culture, and economy revolve around the Brahmaputra. The river flows through the entire breadth of Assam creating a rich floodplain. Rivers and lakes are central components of the hydrological cycle and physical geography. 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.