Complete the following sentences:

Harappa was found in the ______________ Valley of Punjab.

Harappa was found in the Sindhu Valley of Punjab.

Harappa was found by the engineers when they were engaged in laying of railway lines some 150 years ago in the Sindhu valley region. The bricks found in this region was used for laying the railway lines. Later on, research conducted by the archaeologists confirmed that this is a 4600 years old ancient site.