The largest concentration of Harappan sites has been found along the ........

Ancient and Medival History Pre Mauryan Period

The largest concentration of Harappan sites has been found along the:

Sutlej

Indus

Ghaggar-Hakra

Ravi

3rd option is correct.
The largest concentration of Harappan sites has been found along the Ghaggar-Hakra river.

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ghaggar hakra has the largest concentration of harappan sites

Sahib Singh Khatra

according to answer key of test 4556 (art , medievel & culture) question number 30 conducted by abhimanu.

abhimanu admin

Can you please provide the source of your information.