The Desafío Alto Jalón Activity · Santa María de Huerta, Tierra de Medinaceli, Soria Image of Santa María de Huerta, not of the place itself. Created in 2012, this ultramarathon is among the longest foot races in Europe and runs through several municipalities of the upper Jalón, crossing juniper woods, moorlands and gorges in a single continuous day. Photo: Ángel M. Felicísimo from Mérida, España (CC BY 2.0) What to see and do in Santa María de Huerta