第2回　夏の軽井沢と上州中山道ウルトラウォーキング 2026

From Shimosuwa, the route heads for Karuizawa and then continues along the Joshu Nakasendo toward Isobe Onsen. The 2nd edition of 第2回 夏の軽井沢と上州中山道ウルトラウォーキング is described plainly: a summer ultra walk that “hits you physically,” which sounds accurate for a day focused on heat, distance, and old-road endurance. The character of the course is the summer mountain pass crossing: steady forward motion, long stretches where pacing matters more than pride, and the knowledge that Karuizawa is only part of the task, not the conclusion. The finish at Isobe Onsen provides a fitting reward, and the line “Summer pass crossing, challengers wanted!” feels less like hype than a fair warning.