Arhuaco Indian leader Arwa Viku prays to the sky at Los Tunjos lagoon in Sumapaz's 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 ENVIRONMENT POLITICS CONFLICT)
REUTERS/Jose Miguel Gomez