According to Ramsar Convention, Which day is celebrated as World Wetlands Day?

The correct answer is 2nd February.

Explanation:
The Ramsar Convention on Wetlands of International Importance is an international treaty for the conservation and sustainable use of wetlands. It was adopted on 2nd February 1971 in the Iranian city of Ramsar, which lies on the shores of the Caspian Sea.
To commemorate the date of its adoption and to raise global awareness about the critical importance of wetlands to our ecosystem, biodiversity, and human survival, 2nd February is celebrated annually as World Wetlands Day across the globe.