In pics: Some of the world’s most ecologically important wetlands

Moor antelopes walk through the waters of the Okavango Delta in Botswana. The Okavango Delta is an inland swamp formed where the Okavango River reaches a trough in the basin of the Kalahari. First celebrated in 1997, each year World Wetlands Day falls on the anniversary of the day the Convention on Wetlands was adopted: February 2, 1971. [File Photo: IC]