# 2026 Watarase Reservoir Autumn Marathon
_2026渡良瀬遊水地オータムマラソン_

- **When:** Mon, Nov 23, 2026 (JST)
- **Where:** Watarase Retarding Basin — 1834-4 Onobukuro, Kazo-shi, Saitama
- **Map:** https://www.google.com/maps/search/?api=1&query=36.204094,139.666245
- **Price:** price on the official site
- **Category:** Sports & Competitions
- **Official site:** https://up-run.jp/events/mate-wataraseyusuichi2026-4/
- **On Tokyo Events:** https://eventstokyo.com/en/events/2026-watarase-reservoir-autumn-marathon

![](https://up-run.jp/ogp.jpg)

A marathon event will be held at the Watarase Reservoir, a scenic area popular with runners. The course is flat and easy to run, making it suitable for both beginners and experienced runners. The event takes place across a large reservoir area that spans Tochigi, Gunma, Saitama, and Ibaraki prefectures, offering beautiful views throughout the race. With a variety of race options and official timekeeping, participants can challenge their personal best or use the event for training, running at their own pace. Organized by the Sports Mate Run Executive Committee.

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Source: Tokyo Events — https://eventstokyo.com/en/events/2026-watarase-reservoir-autumn-marathon