千波湖チャレンジマラソン2026春(3k/6k/9k/12k/ハーフ)

Senba Lake Challenge Marathon 2026 Spring is a road running challenge event held at Senba Lake in Japan. The event is listed in the organizer's schedule alongside other challenge marathon and sightseeing rogaining events, with the schedule page showing the venue, application status, photos, and links to past results where available. The source notes that events organized through this schedule vary by venue in terms of race offerings and timetable, indicating a locally organized running series format rather than a single large-scale city marathon. Based on the provided text, this race is part of a broader calendar managed by the Tochigi Training Race office, which presents regular opportunities for runners at different locations. The event's identity is centered on Senba Lake as the venue and on accessible challenge-style road running for participants selecting from the listed course options.