Betong 100M is the 115km ultra trail at Amazean Jungle Thailand by UTMB 2027 (Betong Mongkollit Tunnel, Thailand). The race starts on April 30, 2027 at 04:00 PM. It starts in Betong Mongkollit Tunnel and finishes in Betong Clock Tower. The time limit is 32 h.
Hold a steady pace and save energy for every section.
The course climbs 5600m+. With 49m/km of climbing, this is a true mountain course with sustained climbs and descents. By gradient, 39% of the distance is uphill, 36% downhill and 25% flat. The longest climb runs 8.5km at an average 8.6% grade (737m of vertical). The longest descent runs 5.5km at an average 10.1% grade (559m of vertical). The steepest climb averages 42.7% over 0.2km. The steepest descent drops at 34.8% over 0.4km. Flat-equivalent effort: 203.9 FlatKM.
Trekking poles are strongly recommended: about 12.9km of the course is steep enough for them to pay off.
Quad damage risk is high (index 57 of 100), with 51% of the load in the first half: 4 critical descents, the last of them run on already damaged legs. Downhill-specific preparation and a controlled early pace pay off here.
On race day, start temperatures have historically ranged from 27°C to 32°C, with around 19°C at the highest point; the chance of precipitation is about 70%. Heavy rain of 10.0mm or more falls on about 14% of days around this date.
This page has a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for Betong 100M.
Other distances of Amazean Jungle Thailand by UTMB 2027Tunnel 100K (91.0km)·Jungle 50K (56.0km)·Mist 20K (26.0km)·Flower 20K (17.0km)
Other editions of Betong 100M2026·2025
Official websiteamazean.utmb.world
