About Tunnel 100K
Tunnel 100K is the 91.0km ultra trail at Amazean Jungle Trail by UTMB 2026 (Betong, Indonesia). The race starts on April 30, 2026.
Race strategy
Hold a steady pace and save energy for every section.
- 542m descent. Go easy, save your quads.
- Steep 31% wall. Control your pace and stay focused.
- The finish is runnable. Save your legs to run it all the way.
- Long race. Control your HR and effort. Early mistakes cost the most.
- Ease into the early runnable section, save your quads on the descents until 54.8km, then run your race pace.
- Start · 0.0km–1.1km · Race-day nerves push your heart rate up: don't follow the crowd, find your own rhythm.
- Settle in · 1.1km–13.5km · Plus 1 more climb. Ease in: hold back more than feels necessary. The race is still ahead. Climb by heart rate or breathing, not pace. Running pays off here: run wherever you can.
- Work · 13.5km–39.6km · Descent of 321m averaging 10%, descent of 542m averaging 17%, climb of 730m. Plus 1 more climb and 1 descent. This is where the race is built: steady, solid effort. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Hike the steepest pitches.
- Fade · 39.6km–54.8km · Climb of 297m, high point 1165m, descent of 964m averaging 11%. Your energy fades, and that's normal: hold a steady effort and stop counting the miles. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Running pays off here: run wherever you can. Hike the steepest pitches. Your heart rate drifts down on its own: don't chase your early-race numbers, go by feel.
- Home · 54.8km–83.6km · 28.9km of runnable trail. No heroics: settle back into your own effort and hold it to the line. Running pays off here: run wherever you can.
Course
By gradient, 41% of the distance is uphill, 34% downhill and 26% flat. The longest climb runs 10.5km at an average 6.5% grade (682m of vertical). The longest descent runs 8.4km at an average 11.4% grade (964m of vertical). The steepest climb averages 30.9% over 0.5km. The steepest descent drops at 34.0% over 0.2km. Surface: 23% road and 11% smooth. Flat-equivalent effort: 123.8 FlatKM.
Poles
Poles bring little benefit here: only about 14.7km of pole-friendly terrain.
Quad damage
Quad damage risk is moderate (index 44 of 100), with 47% of the load in the first half: 3 descents deserve a plan and a couple of downhill sessions before race day.
- Ease into the early runnable section, save your quads on the descents until 54.8km, then run your race pace.
- #3 · 13.5–16.8 km · 321 m D−, -9.7% · 66.9 km ahead → control
- #1 · 27.3–30.4 km · 542 m D−, -17.1% · 53.2 km ahead → control
- #2 · 46.3–54.8 km · 964 m D−, -11.4% · 28.9 km ahead → control
Results
101 finishers completed the 2026 edition. Men's winner: Peiquan You (China) in 10:43:27. Women's winner: Hua Rong Fu (China) in 13:18:17.
This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for Tunnel 100K.
