The swimming crossing of the Duero Activity · Los Rábanos, Almazán, Soria Image of Los Rábanos, not of the place itself. Every summer, swimmers of all ages swim the stretch of the Duero that separates the city of Soria from the reservoir of Los Rábanos. The event, of long tradition, is held in August taking advantage of the still water of the dam. Photo: Souligne (CC BY-SA 3.0) What to see and do in Los Rábanos