The 24th edition is scheduled for August 2027 in rural Palencia, with free entry and a distinctive countryside course.
The anniversary weekend features several distances, a demanding course and entry fees that need a closer look.
Two days of racing on the Queensland coast, featuring a four-lap marathon and distances for different ages.
Vermont hosts five race formats, with a marathon shaped by rolling hills, rural roads and historic covered bridges.
Cairns welcomes five coastal race distances in July 2027, combining a flat course with tropical conditions.
Five days of Pyrenean trail running, six announced distances and a qualification pathway to the 2028 finals.
Zermatt is set for two days of alpine running in July 2027, with demanding courses and details that need careful reading.
Three days in the mountains of León, different race formats and a challenge that goes well beyond distance.
Modřice is listed as the venue for June 20, with two distances. Start times, entry fees and route details remain unavailable.
Winnipeg offers several distances, a favorable course and a chance to earn a Boston qualifying time.
Three Pyrenean distances, tiered entry fees and courses where elevation matters as much as mileage.
A running weekend in Ireland with a marathon, half and 10K: key dates, entry costs and travel logistics.