Mist 20K is the 26.0km trail race at Amazean Jungle Thailand by UTMB 2027 (Betong Mongkollit Tunnel, Thailand). The race starts on May 2, 2027 at 05:00 AM. It starts in Betong Mongkollit Tunnel and finishes in Betong Clock Tower. The time limit is 9 h.
Run the downhill at race pace, but focus on the climb.
The course climbs 1000m+. With 38m/km of climbing, this is a rolling, mostly runnable course. By gradient, 26% of the distance is uphill, 34% downhill and 40% flat. The longest climb runs 5.9km at an average 6.5% grade (386m of vertical). The longest descent runs 10.1km at an average 5.0% grade (505m of vertical). The steepest climb averages 28.3% over 0.4km. The steepest descent drops at 22.6% over 0.5km. Surface: 28% road and 11% smooth. Flat-equivalent effort: 42.0 FlatKM.
Poles bring little benefit here: only about 1.5km of pole-friendly terrain.
Quad damage risk is low (index 13 of 100): a few descents worth noting, none of them decisive.
On race day, start temperatures have historically ranged from 22°C to 24°C, with around 23°C at the highest point; the chance of precipitation is about 71%. Heavy rain of 10.0mm or more falls on about 15% of days around this date.
This page has a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for Mist 20K.
Other distances of Amazean Jungle Thailand by UTMB 2027Betong 100M (115km)·Tunnel 100K (91.0km)·Jungle 50K (56.0km)·Flower 20K (17.0km)
Other editions of Mist 20K2026·2025
Official websiteamazean.utmb.world