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

The Twin Falls in Kakadu National Park in Australia's Northern Territory. A protected area 171 kilometers southeast of the city of Darwin, the 19,804-square-kilometer park is located in the Alligator Rivers Region. 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: VCG]