Course
Key dates
- ★Race daySun 28 Mar 2027
About
The Horikiri Ecomarathon offers runners a unique opportunity to experience the natural beauty of Japan's Arakawa region. This eco-friendly event takes participants on a scenic course through lush forests and alongside tranquil waterways, showcasing the area's commitment to sustainability. Whether you're an experienced marathoner or a casual runner, the Horikiri Ecomarathon promises an unforgettable adventure in a stunning setting.
Save Horikiri Ecomarathon to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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Shibamata 100K
Flat out-and-back along the Edogawa River floodplain
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Hasetsune Cup
The overnight trail race that launched Japan's ultra scene
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Tokyo Legacy Half Marathon
Uses the Tokyo Paralympic marathon course
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Futako Tama Ecomarathon
Loops past ponds and parkland by the Tama River
A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.