Trail Running · Basque Country

🇪🇸Ehunmilak:
Course Analysis & Race Readiness

171 km with 8,790 m of climbing and matching descent across 31 climbs and 25 descents. Nearly half the course points downhill, demanding relentless legs over a full ultra-distance day and night.

CourseRecon scores your own training against the descending and durability demands that define Ehunmilak — the sample analysis below shows exactly how.

171 km

Distance

+8,760 m

Vertical Gain

−8,760 m

Total Descent

Jul 10, 2026

Last Edition · Past

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The Course · GPS-Measured

What 171 km / 106 mi and 8,760 m / 28,730 ft of vertical gain actually look like

Measured from the GPS track: 171 km / 106 mi and 8,760 m / 28,730 ft of vertical gain. This is the terrain you're signing up for: read it before it reads you.

Course Profile

Segments

Daylight

Terrain summary

Claimed vs GPS-Measured

Claimed · Organizer

171km

Distance

+10,500m

Gain

+0.0 km−1,740 m

GPS-Measured

171km

Distance

+8,760m

Gain

Climb & Gradient

+8,760 mTotal Gain

−8,760 mTotal Loss

Gradient Distribution

25%

Flat

≤3% grade

27%

Run-Climb

3–15% up

11%

Steep Climb

>15% up

37%

Descent

downhill

Steepest Sustained Sections

Descent

KM 147.0–150.0 · −618 m

-23.2%

Climb

KM 55.8–58.4 · +520 m

+20.2%

Climb

KM 140.0–143.0 · +681 m

+19.2%

Descent

KM 50.9–55.6 · −804 m

-17.4%

Finish & Cutoff Times

What it takes to finish

Reference finish times from past results — use them to set a realistic goal pace.

23h 26m

Winning time

38h 25m

Median finisher

48h 00m

Back of pack

What This Race Demands

Four things this course asks of your body

Every course weights the four pillars of mountain-ultra fitness differently. Descending carries 47% of the scoring weight on this course — the terrain makes that the deciding factor.

Weighting shows where readiness is won or lost at this distance — not whether you need each pillar. An aerobic base is a given for a race this long, so it carries little deciding weight even though it's essential — the gaps open on the climbs, descents and the back half.

AerobicSustained engine

Foundational

Sustained output across 171 km and 8,790 m of gain, from 156 m to a 1,500 m high point.

ClimbingVertical power

20%

31 climbs totaling 8,790 m, including a 9.1 km ascent and a single 1,207 m gain.

DescendingEccentric / braking

47%

25 descents shedding 8,790 m, with grades reaching -23.2% and losses up to 904 m.

DurabilityLate-race resilience

33%

Repeated steep loading over 171 km, with very-steep terrain making up over a third of the course.

The Profile in One Line

A 171 km ultra with 8,790 m gain and equal loss, ruled by descending and durability.

Aerobic FoundationalClimbing 20%Descending 47%Durability 33%

Here's how CourseRecon reads a course and an athlete

Sample Readiness Analysis

What a readiness result looks like for this course

This is a worked example for a representative strong mountain-ultra athlete — not your score. Connect your own training and the same analysis runs on you.

Sample

OUT OF 100

QUESTIONABLE

For a representative strong mountain-ultra athlete

This is a sample — connect your Strava to see your own result.

Pillar Breakdown

Aerobic

The 171 km distance and 8,790 m of cumulative gain demand a deep, sustainable engine held steady across an ULTRA-length effort. Roughly 13% flat offers little recovery between efforts.

Climbing

Thirty-one climbs stack up 8,790 m, with very-steep-climb terrain covering 17.1% of the course. The longest ascent runs 9.1 km and the biggest gains 1,207 m, demanding strong sustained uphill power.

Descending

Descending is the dominant demand: 25 descents shed 8,790 m, with very-steep-descent terrain at 18.2% and grades to -23.2%. Quads must absorb long plunges like the 7.7 km descent and the 904 m drop.

Durability

With 45% of the course pointing downhill and repeated steep loading over 171 km, the legs face compounding eccentric damage. Late climbs and descents must be handled on fatigued muscle.

KM 139–143

Late 681 m Climb

Deep into the race, a 3.5 km climb gains 681 m at 19.2%, testing whether climbing legs survive on accumulated fatigue.

KM 147–150

Steepest Descent

Near the finish, a 2.7 km descent drops 618 m at -23.2%, punishing quads already battered by 8,790 m of prior loss.

KM 51–58

Mid-Race Big Climb

A 520 m climb at 20.2% follows an 804 m descent at -17.4%, delivering back-to-back steep loading in the same corridor.

That was a sample