Shonan Int. Relay Marathon 4 hour Run

Race completed

not publishedn/a Distance

not publishedn/a Climbing

not publishedn/a Grit

We hold no course length for this race — a timed or backyard event is measured by the clock, not the kilometre — so there is no Grit score to give you.

35.3351° N, 139.3494° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Field size ~1 Tiny. You will run alone for most of it.

DUV results for the 2025 edition (4h) — ranked runners only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, September

Daytime high 26°C

Night low 18°C

Rainfall Wet — expect rain

Daylight 12 h 12 m of light

Regional 2001-2020 average for September — NASA POWER, grid elevation 233 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	4h	1	Hikari Kobori · 49.978 km	—
2019	4h	4	Hikari Kobori · 55.400 km	—

The field shrank 75% between 2019 (4) and 2025 (1). 0% of the 2025 field were women.

DUV results for the 2025 edition (4h) — ranked runners only. Starters are not published, so the field was at least this big and no finish rate can be given.

Course notes

gear With trail terrain, choose a shoe with moderate cushioning for optimal performance.

Gear for this race

Chosen for this trail race.

Trail Running Shoes Cushioning on trail that is still there in the last quarter.
Race Nutrition Self-supported fuelling between aid stations.
Hydration Vests Flask capacity without the bounce.
GPS Watches Battery life first — an ultra outlasts most full-GPS modes.