My marathons

サロマ湖100kmウルトラマラソン

The organiser has not published a date. Kitami
Saroma
Saroma. Photograph by Seanholland, CC BY-SA 3.0 via Wikimedia Commons

The course

The 100 km runs from in front of the Yubetsu General Gymnasium to the Tokoro Sports Center in Kitami, on a course certified by AIMS and the Japan Association of Athletics Federations.

The course in short 2 lines
  • From Yubetsu to Tokoro along Lake SaromaA lake monument at 42.195 km, the Wakka Nature Garden at 80 to 98 km.
  • Thirteen hours, with 6:30 at halfway13 hours overall, 6:30 at 50 km, 7:48 at 60 km.
Course notes 2 short reads on the course
Whole courseLandmarkFrom Yubetsu to Tokoro along Lake SaromaA lake monument at 42.195 km, the Wakka Nature Garden at 80 to 98 km.

The organiser’s course page puts a monument shaped like Lake Saroma at 42.195 km, a section of national highway without traffic control from about 33 km, and a stretch of trees nicknamed the Witch’s Forest around 65 km. From 80 to 98 km the course runs through the Wakka Nature Garden, which the organiser calls the climax of the course, the hardest and the most beautiful point.

Sourced

Whole courseTacticsThirteen hours, with 6:30 at halfway13 hours overall, 6:30 at 50 km, 7:48 at 60 km.

The 41st edition ran on Sunday 28 June 2026, with places for 3,600 runners in the 100 km and 600 in the 50 km, and a minimum age of 19 on race day. Runners collect the bag they left at the start at a rest station near 54.5 km.

Sourced

Race fuel

Energy gel
An energy gel sachet
Illustration · drag to turn

14 gels for Kitami, plus 1 spare

Finish

One every 40 minutes, by the clock:

Over this distance most runners mix in real food at the aid stations; the gels cover the hours between.

  1. km 6.7mile 4.1
  2. km 13.3mile 8.3
  3. km 20mile 12.4
  4. km 26.7mile 16.6
  5. km 33.3mile 20.7
  6. km 40mile 24.9
  7. km 46.7mile 29
  8. km 53.3mile 33.1
  9. km 60mile 37.3
  10. km 66.7mile 41.4
  11. km 73.3mile 45.6
  12. km 80mile 49.7
  13. km 86.7mile 53.9
  14. km 93.3mile 58

Our pick: SiS BETA Fuel gel, box of 6, strawberry and lime. 40 g of carbohydrate a gel, about twice a usual gel, from two kinds of sugar your body takes up side by side.

Easy to forget on race morning: pack them with your bib the night before.

Get it on Amazon

We earn a small fee if you buy through these links. The price is the same.

In Canada the button opens GU Energy Gel, Salted Caramel, 24-pack, the best seller there.

Outside the Netherlands, Belgium, Germany, Austria and Switzerland, the UK and Ireland, Spain and Portugal, Italy, the rest of the EU and Canada the button opens GU Energy Gel, Chocolate Outrage, 24-pack on Amazon.com, the best seller there.

Anti-chafe
Compeed Anti-blister stick
Photo: Compeed

Compeed

Compeed anti-blister stick, 8 ml

Best selling on Amazon amazon.nl, read 2 Nov

An invisible layer before the start keeps seams, straps and shoes from rubbing skin raw.

Put it on before you leave for the start: heels and toes, inner thighs, under a bra or heart-rate strap.

Try it on a long run first, like everything you use on race day.

Get it on Amazon

We earn a small fee if you buy through these links. The price is the same.

Number belt
A race number belt
Illustration · drag to turn

Compressport Race Belt

Holds your bib without safety pins through your top, with loops for up to 8 gels.

Clip the bib on the night before, so it goes on with your shorts in the morning.

Keep the number on the front, where officials and photographers can see it.

Get it on Amazon

We earn a small fee if you buy through these links. The price is the same.

Electrolytes
A tube of electrolyte tablets
Illustration · drag to turn

SiS Hydro electrolyte tablets, tube of 20

One tablet in a bottle puts back some of the salt you sweat out.

One tablet in 500 ml of water in the hour before the start.

Only if you have used them in training: nothing new on race day.

Get it on Amazon

We earn a small fee if you buy through these links. The price is the same.

Blister plasters
Compeed Blister plasters, medium, 6
Photo: Compeed

Compeed

Compeed blister plasters, medium, 6

Best selling on Amazon amazon.nl, read 2 Nov

One in a pocket cushions a blister if one starts.

Put it on clean, dry skin and leave it until it comes off by itself.

Give a couple to whoever comes to cheer, so they are there at the km you need them.

Get it on Amazon

We earn a small fee if you buy through these links. The price is the same.
distance
100.0 km62.1 mi

Trip

Getting a place

Entry through the organiser

Entry details on the organiser’s site →

The organiser, a third party. We take no entries and have no part in the race.

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