Water quality threat to Colombia's Lake Tota
21 August 2012 Last updated at 18:20 BST
Colombia's iconic Lake Tota is the country's biggest lake and a key habitat for local wildlife, including several threatened or endangered bird species.
But the World Wetlands Network has given it 'Grey Globe' status to highlight the fact that its water quality is under threat from sources such as sewage and local industries.
Arturo Wallace reports.