Built on the bed of the river Guaro and with contributions from the rivers Salia, Benamargosa, Bermuza, Rubite, and the Madre del Llano de Zafarraya stream. It has the largest capacity in the province of Malaga with 170 cubic hectometres, for a maximum reservoir height of 230 metres. It covers the valley that separates La Viñuela from Los Romanes, the surface area of the basin regulated by the river Guaro is 119 km2.
Its waters supply the irrigation of the south of the Axarquía and, in case of need, drinking water for the city of Málaga.
The area surrounding the reservoir is an area of great scenic wealth with facilities for water sports and a recreational area with barbecues, mini-golf and a football pitch. Another possibility, and one of the most popular, is fishing. In its waters, with the corresponding permit, you can catch carp, barbel and eels.