Arhuaco Indian leader Arwa Viku plays a melody on a conch shell on the banks of Los Tunjos lagoon in Sumapaz National Park in this file picture taken April 3, 2009. In mountainous central Colombia, Viku's Arhuaca Indian tribe is concerned that the country's water supply is being threatened by an expanding unregulated agricultural sector. Picture taken April 3, 2009. To match feature COLOMBIA-WATER/ REUTERS/Jose Miguel Gomez/Files (COLOMBIA POLITICS CONFLICT ENVIRONMENT)
REUTERS/Jose Miguel Gomez