荒川ハーフマラソン 2026（初夏）

Arakawa Half Marathon 2026 (Early Summer) is a running event based at Horikiri Mizube Park in Katsushika, Tokyo, using the riverside setting of the Arakawa area. The course is described as mostly flat and paved with asphalt, with several rises and dips around the elevated structures. Its loop format gives runners frequent opportunities to pass one another, creating the open, shared atmosphere typical of a riverbank course rather than a lonely point-to-point route. The event emphasizes strong value while still providing core race services. Each runner uses a timing tag, and results such as lap information, category placing, overall placing, and finish time can be checked through the official live timing site. After finishing, participants can also access a web finisher certificate, which can be saved, shared, or printed. The organizer highlights its measurement technology, quick result delivery, and guest support as distinctive features of the race. The event also includes guest runners, an event MC, and support from BOOST Pacers. The pacer team is presented as part of BOOST's broader effort to keep providing places for runners to pursue their goals, adding structure and encouragement for participants aiming for a target performance. The course is not closed exclusively to the event, so the race asks participants to share the path carefully with general runners and pedestrians. Overall, it is positioned as an accessible, well-supported urban riverfront running event with a practical race operation and a lively support atmosphere.