Jeju 100M

UTMB World Series

148.0km

October 2

Jeju,

South Korea

utmb·source

Set your ITRA PI

Estimated Finish

24:49:59

ITRA PI

Segment Details

1/12

+0.9% · 0.25km · 3m+ · 1m-

82m80m

0.00km0.25km

OSM ↗

highway

secondary 82%residential 18%

review

Elevation Profile

Trail 54% · Technical 6%Technical 6%

2.3TDI

150.1km

199.4FlatKM

5020m+

5025m−

1913max

59min

0:48

6.7km

2:11

13.1km

1:34

8.4km

1:17

12.2km

4:11

17.8km

1:21

7.9km

2:31

19.3km

3:00

16.8km

1:36

10.3km

2:30

11.0km

2:03

9.6km

1:50

11.6km

OSM

AID

Distance

Time

Gain

Loss

Gels

Water

Salts

Segment

6.7km/6.7km

0:48/0:48

362m+

26m−

0.8×40g(31g)

0.6L

2(400mg)

19.9km/13.1km

2:59/2:11

980m+

155m−

2.1×40g(86g)

1.6L

4(800mg)

28.3km/8.4km

4:32/1:34

477m+

755m−

1.5×40g(62g)

1.2L

3(600mg)

40.5km/12.2km

5:49/1:17

219m+

576m−

1.3×40g(51g)

1.0L

3(600mg)

58.3km/17.8km

10:01/4:11

1370m+

1238m−

4.1×40g(165g)

3.1L

8(1600mg)

66.2km/7.9km

11:21/1:21

20m+

339m−

1.3×40g(53g)

1.0L

3(600mg)

85.4km/19.3km

13:52/2:31

492m+

673m−

2.5×40g(99g)

1.9L

5(1000mg)

102.3km/16.8km

16:52/3:00

364m+

279m−

3.0×40g(118g)

2.2L

6(1200mg)

112.5km/10.3km

18:27/1:36

245m+

219m−

1.6×40g(63g)

1.2L

3(600mg)

123.5km/11.0km

20:58/2:30

532m+

156m−

2.5×40g(99g)

1.9L

5(1000mg)

133.1km/9.6km

23:00/2:03

393m+

423m−

2.0×40g(81g)

1.5L

4(800mg)

144.7km/11.6km

24:50/1:50

180m+

676m−

1.3×40g(52g)

1.4L

4(800mg)

AID

Distance

Time

Gels

Water

Salts

Gradient Matrix

Extra

Select a gradient

Uphill

Downhill

>40%

30%

25%

20%

15%

10%

0.5

0.3

0.2

0.3

0.5

Uphill

>40%

30%

25%

20%

15%

10%

0.2

0.3

0.5

10%

15%

20%

25%

30%

>40%

Downhill

Technical sections presentDarker — steeper and longer

Extremes

Gradient Breakdown

34% / 51.5km29% / 42.9km37% / 55.8km

Uphill

>40%×10.2km

25–30%×42.5km

20–25%×22.2km

15–20%×41.6km

10–15%×1613.2km

3–10%×2431.7km

Downhill

30–40%×10.9km

25–30%×20.9km

20–25%×21.1km

15–20%×63.4km

10–15%×117.8km

3–10%×2741.7km

Peaks for this course have not been detected yet.

Skyrunning · ISFSource

ISF technical requirements

Average incline3.3%> 6.0%

Steep sections (30%+)0.7%≥ 5.0%

Max altitude1913 m> 2000 m

Vertical climb5020 m> 1300 m

Asphalt27.6%< 15.0%

UIAA Technical climbing8.2 kmGrade I–II

Possible levelnot enough requirements met to estimate a level

Level 10/1

Peak reachno detection

Level 21/3

Altitude ≥ 3000 m1913 m

Scrambling8180 m

Rocky footing0 m

Level 30/3

Via ferrata0 m

Glacier0 m

Exposed ridge0 m

About Jeju 100M

Jeju 100M is a 148 km ultra trail of TransJeju by UTMB 2025 in Jeju, South Korea. The race starts on October 2, 2025. The course climbs 5020 m+ and descends 5025 m−, between a low point of 59 m and a high point of 1913 m. By gradient, 34% of the distance is uphill, 37% downhill and 29% flat. The longest climb runs 9.8 km at an average 14.3% grade (1408 m of vertical). The longest descent runs 9.1 km at 12.7% (1162 m of vertical). Surface: 54% trail, 28% road, 7% smooth, and 6% technical. Flat-equivalent effort: 199.4 FlatKM.

307 finishers completed the 2025 edition. Men's winner: Minchul Ko (South Korea) in 16:55:51. Women's winner: Arika Ito (Japan) in 21:28:03.

This page has the full results and splits, interactive elevation profile, gradient matrix, pacing and nutrition planner and weather climatology for Jeju 100M.

Other distances of TransJeju by UTMB 2025Jeju 100K (100 km)·Jeju 70K (70.0 km)

Other editions of Jeju 100M2026

Official websitetransjeju.utmb.world