千波湖チャレンジマラソン2026秋(3k/6k/9k/12k/ハーフ/30k)

The Senba Lake Challenge Marathon Autumn is a loop race around Lake Senba, utilizing a 3,000-meter lakeside lap. Participants can select from 3k, 6k, 9k, 12k, half marathon, or 30k distances, making the course suitable for short runs, pace practice, and extended training. The route is nearly flat asphalt and is a JAAF-certified course. It is designed for accurate pacing, with distance markers every 100 meters and larger signs every 500 meters. Half marathon and 30k participants begin in waves based on target time, which makes the event particularly useful for those incorporating it into their training rather than solely as a race day objective.