The Harappan site of Mohenjo-daro is situated on the bank of the river:

Mohenjo-daro is situated on the right (western) bank of the Indus river, in the Larkana district of Sindh province, Pakistan.

About Mohenjo-daro:

• The name means "Mound of the Dead" in Sindhi.
• It was one of the largest cities of the Harappan (Indus Valley) Civilisation, which flourished in its mature phase from about 2600 BCE to 1900 BCE.
• It was excavated in the 1920s.
• It was declared a UNESCO World Heritage Site in 1980 ("Archaeological Ruins at Moenjodaro").

Features of the city:

• Like other Harappan cities, it had a raised western part and a larger lower town to the east.
• Streets were laid out in a grid pattern, crossing each other at right angles.
• Houses were built of baked bricks of standard size, and many had their own wells and bathrooms.
• It had a well-planned covered drainage system.
• Important structures include the "Great Bath", a large public water tank, and a large building often called the "Granary" (or Great Hall).
• Important finds include the stone sculpture known as the "Priest-King", seals with animal figures, and many beads and ornaments.

About the Indus river:

• It rises near Lake Mansarovar in Tibet.
• It flows through Ladakh and then through Pakistan to the Arabian Sea near Karachi.
• Its main tributaries from India are the Jhelum, Chenab, Ravi, Beas and Sutlej.
• The civilisation is named after the Indus because many of its early-discovered sites lay in the Indus basin.

Threats to the site:

Rising salt and groundwater, floods and weathering are damaging the ancient bricks.

Why not the other options?

• ✗The Ravi flows past another major Harappan city in Punjab (Pakistan).
• ✗The Ghaggar (Ghaggar-Hakra) has sites such as Kalibangan.
• ✗The Sutlej has the site of Ropar.