Tokyo

Ultra MarathonEN

The 11th Tama River Nature Marathon (Tokyo Ultra 100K)

第11回多摩川ネイチャーマラソン（東京ウルトラ100キロ）

Date

Date TBA

Location

Tokyo

Distance

Ultra Marathon

Entry Fee

—

Time Limit

13h

Capacity

—

Finish Rate

—

Last updatedJuly 20, 2026·71 days agoOfficial site checkedSeptember 28, 2026Info may be outdated

Suggest a correction →

AI summary

ULTRA

Aid stations

StandardThere are water stations every 10 km (water, sports drinks, and nutritional supplements)

Time limit & cutoffs

100 km: 13 hours, 80 km: 10 hours, 60 km: 8 hours, 50 km: 7 hours. There are checkpoints at various locations (e.g., the 40 km turnaround point closes at 12:00).

Start time

100 km: Start between 6:00 and 6:15; 80 km: Start between 7:00 and 7:15; 50 km and 60 km: Start between 7:30 and 7:45. Shotgun start format.

Summary for guidance. Always confirm mandatory gear and rules on the official site. Last verified: June 22, 2026

Access

ACCESS

Note: the map shows the approximate area. Check the official site for the exact start/venue.

Find a place to stay

STAY

Search hotels in the race area on an external booking site.

Search on Rakuten Travel ↗Search on Booking.com ↗

Links to external booking sites (affiliate programs may be used). Reservations and payments are handled on each site.

Score

RATINGSAuto-calculated from market research, official data, and online voicesSome scores unavailable（4/6）

Course Appeal

コースの魅力

N/A

Organization & Support

運営・サポート

N/A

Finishability

完走しやすさ

0.0

Atmosphere

大会の盛り上がり

N/A

Access

アクセス

3.0

Value for Money

コスパ

N/A

English Support

INBOUND

English information page available on the official site.

Entering from overseas

INBOUND

Open to overseas runners

How to enter

Pre-race mailing of bib and course materials to a specified address; an English version of the health questionnaire is available on the official site.

What you need

Runners must sign and submit a health questionnaire/pledge on race day. A domestic mailing address is needed for pre-race bib delivery; overseas runners should confirm international shipping is possible.

Bib pickup

Bibs and materials are sent in advance to a specified address. Race-day reception opens 40 minutes before each start time.

Entry period

Entry deadline is Sunday 22 March 2026 via the official site or agency partners. Late entry accepted until Sunday 5 April 2026 via the dedicated 'Rakuraku Login' system at an extra ¥1,000.

On race day

English health questionnaire is provided. First-aid staff and safety marshals patrol the course.

Notes

The race is a self-supported ultra along the Tamagawa riverbank (50/60/80/100 km). No parking available; access is by train. DNF runners must make their own way home; baggage can be forwarded by courier (cash-on-delivery).

Summary for guidance. Always confirm details on the official site. Last verified: July 20, 2026