With reference to the Indus river system, of the following four rivers, three of them pour into one of them which joins the Indus directly. Among the following, which one is such river that join the Indus direct?

The correct answer is Sutlej.

Step-by-Step Explanation:

1. Understanding the Geography of the Indus River System:
The main left-bank tributaries of the Indus River in the Punjab region are the Jhelum, Chenab, Ravi, Beas, and Sutlej. These five rivers collectively give Punjab its name ("Land of Five Rivers").

2. Flow and Confluence Pattern of the Tributaries:
• The Jhelum flows into the Chenab at Trimmu.
• The Ravi joins the Chenab near Ahmadpur Sial.
• The Beas joins the Sutlej at Harike in Punjab, India.
• The combined waters of the Jhelum, Chenab, and Ravi merge into the Chenab.
• Eventually, the Chenab meets the Sutlej near Uch Sharif to form the Panjnad River (or combined flow).

3. Direct Entry into the Indus:
The Sutlej River receives the combined flow of the other tributaries (Jhelum, Chenab, Ravi, and Beas) and then joins the Indus River directly at Mithankot in Pakistan.

Therefore, among the given options, the river that collects the waters of the other rivers and joins the Indus directly is the Sutlej.