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Tokyo

Half Marathon

Koto Seaside Marathon

江東シーサイドマラソン大会

Date
November 29, 2026
Location
Tokyo
Distance
Half Marathon
Entry Fee
¥8,500
Time Limit
Capacity
4,000 runners
Finish Rate
Last updatedJune 12, 2026·20 days agoOfficial site checkedJune 12, 2026

AI summary

COURSE

Course certification

JAAF certifiedCourse Certified by the Japan Association of Athletics Federations (Public Interest Incorporated Foundation)

Cutoffs & time limit

Half Marathon: 5 km checkpoint at 38 minutes (9:53), 15 km checkpoint at 105 minutes (11:00), 20 km checkpoint at 140 minutes (11:35), finish cut-off at 150 minutes (11:45)

Start method

Start Times: Half Marathon at 9:15 a.m., 10K at 9:45 a.m.

Finisher rewards

Participation Prize: Commemorative race T-shirt. Finishers will receive a certificate of completion (both paper and online). Top finishers will receive a certificate and a medal (Koto Ward Mayor’s Award).

Changing & baggage

Luggage storage available (valuables not accepted)

Summary for guidance. Always confirm details 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.

Score

RATINGSAuto-calculated from market research, official data, and online voicesSome scores unavailable4/6

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

N/A

Atmosphere

大会の盛り上がり

N/A

Access

アクセス

3.0

Value for Money

コスパ

2.5
Course AppealN/AOrganization & SupportN/AFinishabilityN/AAtmosphereN/AAccess3.0Value for Money2.5

Runner Reviews

REVIEWS
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Overall Score

2.8

/ 5.0 · 6-axis avg