Linie1629 Ultra 2026

Linie1629 Ultra is a 50 kilometer ultramarathon around 's-Hertogenbosch in the Netherlands, starting and finishing at Kasteel Maurick in Vught. Runners set off in the morning for a flat, paved route that follows the Linie1629 bicycle path, suitable for experienced marathoners seeking a first step beyond 42.2 kilometers. The race is serious: entrants are expected to be well trained, to have completed multiple marathons, and to finish within a six-hour limit. The loop follows the historic defense lines tied to the siege of Den Bosch roughly four centuries ago, passing old fortifications and nature areas. It is not a closed-road course; runners share the paved bike path and must watch their own safety. Four aid stations support the field, composed of dozens of committed ultra runners rather than a large group. The event embraces the unique pleasure of running a route most people would choose to cycle.