Corpach, United Kingdom · Saturday, July 4, 2026

Fixed Distance 100K

Great Glen Ultra Marathon 72mi

Race completed
116 km Distance
8,500 m Climbing
10.0 Grit · Elite / extreme
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56.8428° N, 5.1221° W © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 73 m / km Vertical. Extreme verticality. This is a technical mountain course with sustained steep grades.
Time limit 22 hours 11:23 min/km average. Generous. Walkable throughout for most of the field. More forgiving than 66% of 100K races. Measured against 203 races of the same distance. Cut-off calculator →
Field size ~29 Small. Long stretches with nobody in sight.

DUV results for the 2024 edition (72mi) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, July

Daytime high 15°C
Night low 9°C
Rainfall Showers likely
Daylight 17 h 41 m of light

Regional 2001-2020 average for July — NASA POWER, grid elevation 382 m. Not a forecast.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a vertical course. Poles are highly recommended for the sustained climbs.

By UltraHub Expert
👟 gear

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

By UltraHub Expert
🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 116 km of trail with 8,500 m of ascent.

  • Trail Running Shoes 73 m of climb per kilometre — grip and rock protection before cushioning.
  • Race Nutrition Past 116 km the palate quits before the legs do — carry more than one flavour.
  • Hydration Vests Pole attachment and chest-strap stability on steep ground.
  • Trekking Poles 8,500 m of ascent to walk up.
  • Headlamps A 22 h limit puts you out there after dark.

Asics

Trabuco Max 3

★★★★★ 4.6

Salomon

Ultra Glide 4

$159.95 ★★★★★ 4.6

Maurten

Gel 100

Hydrogel technology for 25g carbs per gel with minimal GI distress.

$3.5 ★★★★★ 4.7

Nathan

VaporKrar 12L

12L race vest co-designed with ultra champion Rob Krar, with insulated bladder pocket.

$170 ★★★★★ 4.6

LEKI

Ultratrail FX.One

Ultra-light carbon folding poles (135g each) designed for mountain ultra racing.

$200 ★★★★★ 4.6

Nitecore

UT32

Dual-beam trail running headlamp (1100 lumens) with spot and flood beams.

$100 ★★★★★ 4.5
All gear guides →

Course Notes

You have to run the 72 miles from Fort William to Inverness along the historic Great Glen. The terrain is a mixture of canal towpaths, forestry paths and tracks, and a little time spent on roads.

Similar races

Other 100K trail ultras, closest in distance first.