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UPSC Prelims 2019 · Indian Geography · Rivers, Lakes and Dams

Consider the following pairs: Glacier — River Which of the pairs given above are correctly matched?

  1. Bandarpunch — Yamuna
  2. Bara Shigri — Chenab
  3. Milam — Mandakini
  4. Siachen — Nubra
  5. Zemu — Manas
Show the answer and explanation

Answer: (a) 1, 2 and 4

Bandarpunch, Bara Shigri and Siachen are matched correctly.

Statement by statement

1. ✓ CORRECT Bandarpunch glaciers feed the Yamuna.

2. ✓ CORRECT Bara Shigri (Lahaul) feeds the Chenab.

3. ✗ WRONG Milam glacier feeds the Goriganga; the Mandakini comes from Chorabari near Kedarnath.

4. ✓ CORRECT Siachen meltwater forms the Nubra, a tributary of the Shyok.

5. ✗ WRONG Zemu glacier (Kangchenjunga) feeds the Teesta, not the Manas.

The idea

Glacier melt enters a local stream that may join a larger named river downstream. A glacier–river pair can therefore refer to a drainage basin, rather than the stream immediately at the ice front. Trace the connecting tributaries before rejecting a basin-level match.

Siachen ice melts → Meltwater enters the Nubra → Nubra joins the Shyok → Shyok joins the Indus → Water continues through the Indus basin

Why the others are wrong

(b) Milam does not feed the Mandakini.

(c) Zemu feeds the Teesta.

(d) Both 3 and 5 are wrong.

The trap

Milam and Zemu are real glaciers linked to famous but wrong rivers.

Elimination technique

Milam belongs to the Goriganga–Kali system, not Mandakini, so pair 3 removes (b) and (d). Zemu belongs to the Teesta system, not Manas, removing (c).

Also know

Gangotri feeds the Bhagirathi, and Chorabari feeds the Mandakini near Kedarnath. Milam feeds the Goriganga, which joins the Kali system. Bara Shigri drains to the Chandra, one headstream of the Chenab. These intermediate links explain why a broad basin name can still be a valid match.

🔒 Gangotri → Bhagirathi · Chorabari → Mandakini · Milam → Goriganga · Zemu → Teesta · Siachen → Nubra.

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