The Transibérica is an unsupported ultra-distance race run by Transibérica Ultracycling. It is a free-route event with 10 checkpoints: each rider chooses the way between control points, so there is no single track.
According to the organiser’s website, the 2027 edition is set for 4 September 2027. In 2026 the race started from Flanders.
The distances in circulation differ by source (about 3,199 km in the bikepacking.com listing and 1,400 km in the Construyendo Ultraciclismo calendar), so this sheet does not state a distance until the organiser confirms it.