What should be given the most attention in difficult map questions on Himalayan rivers?

Correct answer: Source, tributaries, confluence and mouth

The direct answer is D: source, tributaries, confluence and mouth. Difficult river maps should be solved by reading the complete drainage system. First find where the river begins, or its source; then follow its main course; identify tributaries that join it; mark important confluences; and finally locate the mouth where the river enters the sea, a lake or another river. Option D is correct because all four are essential geographical clues for identifying a Himalayan river on a map. Option A, the taste of river water, is not represented on a normal map and does not identify a river’s course. Option B, the number of riverside trees, is not a stable drainage feature and is not normally a map-reading requirement. Option C, the colour of fish, is biologically incidental and irrelevant to the river network. A common mistake is to recognise only the river’s name but ignore its tributaries or mouth. For exams, practise tracing the whole route, not merely memorising one point.