Which one of the following is not a Harappan site?

The correct answer is C) Sohgaura. Sohgaura is in Gorakhpur district of eastern Uttar Pradesh, and it is famous for a Mauryan-period copper plate inscription, not for Harappan remains.

Why the others are Harappan sites:

• Chanhudaro (Sindh, Pakistan): a Harappan town known for bead-making and shell-working, and notably without a citadel.
• Kot Diji (Sindh, Pakistan): its pre-Harappan phase, with a fortified settlement, is important for the Harappan urban story.
• Desalpur (Kutch, Gujarat): a fortified Harappan settlement, relevant to the Harappan presence in Gujarat.

The core concept is the geographic spread of the Harappan (Indus Valley) Civilisation, which covered Sindh, Punjab, Cholistan, Kutch, Saurashtra and parts of Haryana and western UP. For Mains, this spread supports questions on urbanisation, trade networks and the reasons for urban decline.

Trap: Aspirants assume every UP site is Harappan because Alamgirpur and Hulas in western UP are late Harappan. Sohgaura is in the east and belongs to a later period, so check the region and the period, not just the state.