The Tomato Bank 6-Hour Relay Marathon Okayama is a team running event in Okayama City, Japan. It centers on six hours of shared laps instead of a single runner finishing alone. Teams complete a marathon distance of 42.2 km by passing a single tasuki sash from runner to runner. Adults and children can participate together in this stadium event.
Participants enter as workplace groups, clubs, circles, and families, making the field more social than strictly competitive. TV Setouchi organizes the race with Sanyo Shimbun as co-organizer. The published entry caps are 650 teams and a separate 300-person limit. Registration may close early if these limits are met. The event emphasizes teammates supporting each other for the full six hours, meeting new people, and strengthening friendships through the race day.