# 2026 Inage Seaside Park Winter Marathon
_2026稲毛海浜公園ウィンターマラソン_

- **When:** Sun, Dec 27, 2026 (JST)
- **Where:** Inage Seaside Park, Chiba Mihama — 7-2 Takahama, Mihama Ward, Chiba City, Chiba
- **Map:** https://www.google.com/maps/search/?api=1&query=35.62006,140.059479
- **Price:** price on the official site
- **Category:** Sports & Competitions
- **Official site:** https://up-run.jp/events/up-inage-2026/
- **On Tokyo Events:** https://eventstokyo.com/en/events/2026-inage-seaside-park-winter-marathon

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

A marathon event for those who run regularly or want to experience running with others. The course at Inage Seaside Park is surrounded by nature. The seaside section can be windy at times, but is known for its open atmosphere and is popular among runners for its pleasant route. Automatic timing is available, making it a great opportunity for those who want to measure their time. Organized by the UP RUN Executive Committee.

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Source: Tokyo Events — https://eventstokyo.com/en/events/2026-inage-seaside-park-winter-marathon