Which one of the following is not a Harappan site?

The correct option is Sohgaura.

Step-by-Step Explanation:

1. Harappan Sites:
- Chanhudaro: Located in modern-day Sindh, Pakistan, it is a prominent Indus Valley Civilization site known for craft production, bead-making, and shell-working.
- Kot Diji: Also located in Sindh, Pakistan, it is an important pre-Harappan and Harappan site.
- Desalpur: Located in the Kutch district of Gujarat, India, it is a fortified Harappan site along the Bhadar River.

2. Sohgaura:
- Sohgaura is located in the Gorakhpur district of Uttar Pradesh, India. It is famous for the Sohgaura copper plate inscription, which is written in the Prakrit language using the Brahmi script. It dates back to the Mauryan period (around 3rd century BCE) and mentions drought relief measures and storehouses.
- Therefore, Sohgaura is not a site of the ancient Harappan Civilization (Indus Valley Civilization).

Thus, among the given choices, Sohgaura is not a Harappan site.