Lost Horizons is a self-supported 830-kilometre gravel event through the remote highlands of inland Castile, starting in Soria and looping through some of the most sparsely populated and least-ridden terrain in mainland Spain. With 13,000 metres of elevation gain, the route traverses the high Castilian meseta, the ancient canadas (drove roads) used by shepherds for centuries to move livestock between seasonal pastures, pine-forested mountain sierras, and remote villages that see almost no cycling tourism. Soria is the provincial capital of Spain's least-populated province — a fact that shapes the entire character of the event. The landscape is one of wide skies, ancient stone, and an almost complete absence of commercial cycling infrastructure, which means riders must plan resupply carefully around village shops with irregular hours, roadside bars, and the occasional petrol station. The July timing brings warm conditions on the lower meseta and cooler but potentially stormy weather in the higher sierras. Lost Horizons has built a devoted following among riders who appreciate the cultural depth of Castile — the landscape here is full of Romanesque churches, medieval castles, and roads that follow paths used since Roman times. It is one of the hidden gems of the European ultra-gravel calendar and deserves a much wider international audience.
Based on this event's terrain, difficulty and riding style.
Lost Horizons covers 830 km with 13000 m of climbing along the way — a steadily rolling profile from start to finish.
For Lost Horizons, we'd recommend a Gravel Bike — plan on 45-50mm Tubeless tires and a wide-range drivetrain, something like a 38-40T (1x) chainring paired with a 10-51T cassette, to handle the terrain comfortably.
Lost Horizons carries an overall difficulty rating of Advanced. The terrain itself is rough, technical terrain for a good stretch of the route, the climbing is steadily rolling, with a healthy amount of climbing, and conditions tend to run mild and generally comfortable.
Mark your calendar for July 19, 2026 — Lost Horizons's summer timing means with long daylight hours, though heat can become a real factor.
Lost Horizons runs primarily on gravel, and we'd recommend 45-50mm Tubeless tires to handle it comfortably.