International World Water Day is held annually on 22 March as a means of focusing attention on the importance of freshwater and advocating for the sustainable management of freshwater resources.An international day to celebrate freshwater was recommended at the 1992 United Nations Conference on Environment and Development (UNCED). The United Nations General Assembly responded by designating 22 March 1993 as the first World Water Day.Each year, World Water Day highlights a specific aspect of freshwater. The theme of the 2011 world water day is Water for Cities: Responding to the urban challenge. Over half of the world's population now lives in cities, 3,3 billion people. This urbanisation brings all sorts of questions on urban water management. Celebrations will be held in Cape Town, South Africa, from March 20, untill March 22.