Lost Horizons

Lost Horizons is an unsupported gravel ultracycling event in the province of Soria, in Spain's Castilla y León region, covering roughly 830 km and 13,000 m of climbing across remote rural Castilian terrain. The 2026 edition runs from 19 to 24 July, giving riders six days to complete the fixed track in a self-sufficient format. It is organised by the Lost Horizons Cycling Club, based in the city of Soria, and recognised on the World UltraCycling Association calendar.