Behobia–San Sebastián 20K

Behobia–San Sebastián is one of Spain's most iconic road races: a point-to-point 20 km (12.4 mile) classic run every mid-November from the border hamlet of Behobia, in Irún, to the Boulevard in the heart of Donostia/San Sebastián. First run in 1919, it is one of the oldest road races in continental Europe and now draws roughly 27,000-30,000 runners, making it one of the largest mass-participation road races in Spain, on par with Madrid's or Barcelona's biggest events. The course is deceptively tough for its distance: after a fast opening through Irun, runners hit the Alto de Gaintxurizketa around km 7-8, a sharp climb that thins the field early, followed by rolling terrain and a second rise at the Alto de Miracruz near km 16 before a fast descent into San Sebastian and the seaside finish on the Boulevard, steps from La Concha bay. Total positive elevation gain is around 192 meters. The race is organized by Club Deportivo Fortuna and is famous for its festive, whole-region atmosphere: crowds line the entire route through Irun, Lezo, Pasaia, and San Sebastian, and because of overwhelming demand the organizers now allocate the bulk of general entries via a public lottery. It is explicitly NOT the same event as the San Sebastian Marathon, a separate race held on a different course and date; Behobia-San Sebastian's signature and only standard distance is the 20K.