Behobia-San Sebastián Activity · Irun, Bidasoa Beherea / Bajo Bidasoa, Gipuzkoa Image of Irun, not of the place itself. Popular race of about 20 km between the Behobia quarter, in Irun, and San Sebastián, held every November. Born in 1919 and continuously revived since the 1970s, it is one of the most heavily attended long-distance races in Spain, with more than 28,000 runners in recent editions. cada mes de noviembre Photo: Pascual Marín (CC BY-SA 3.0) What to see and do in Irun