Undated image shows a man working on the bank of the Cauca River at the entrance of Salvajina reservoir, Cauca department, Colombia. Although rains have been registered this week and partly relieve the drought in some rivers of the country, the basins of the rivers Magdalena and Cauca remain the most affected by the season of El Nino, according to information from the Institute of Meteorology, Hydrology and Environmental Studies (IDEAM, for its acronym in Spanish) of Colombia. (Xinhua/Oswaldo Paez/COLPRENSA)