Races
Borneo Ultra-Trail Marathon
Malaysia, April. 106 km on 75% trail. +21,801 ft of climbing. 34 hours cutoff.
- Start328 ft
- High848 ft
- Low99 ft
- Finish358 ft
- Malaysia at mile 0.0
- Borneo Ultra-Trail Marathon mile 14 at mile 14, cutoff 6.800000000000001 hours
- Borneo Ultra-Trail Marathon mile 27 at mile 27, cutoff 13.600000000000001 hours
- Borneo Ultra-Trail Marathon mile 41 at mile 41, cutoff 20.4 hours
- Borneo Ultra-Trail Marathon mile 54 at mile 54, cutoff 27.200000000000003 hours
- Finish Malaysia at mile 68, cutoff 34 hours
Geometrycourse math
Weather at the cruxcourse math
At hour 8 of race, feels like 40 C (92 F).Sample of 7 race days, medium confidence.At hour 8 of race, apparent temperature P90 is 40 C / 103 F.
The cruxHumid climbs, ridge exposure, and aid gaps in remote terrain (near mile 43)
Course DNA
The Course
Borneo Ultra-Trail Marathon runs 106 km through Malaysia. Surfaces skew 75% trail / 20% dirt road / 5% paved. Humid climbs, ridge exposure, and aid gaps in remote terrain. High point near 850 ft. Low near 92 ft. April temps run 50°F to 85°F. The course rewards patience early and punishes rushed descents after mile 33.
The Work
Train for the climbing across 106 km. Back-to-back long runs on trail. Practice power-hiking grades above 15 percent. 34 hours total means limited margin: rehearse fueling every 45 to 60 minutes and downhill eccentric work weekly. Technicality 5/10. Build a block that simulates the crux near mile 43.
Kit
April in Malaysia: plan for 50°F to 85°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 34 hours pushes past dark. Poles help on sustained climbs above mile 16. Vest capacity for 2 liters minimum. Shoes matched to 75% trail: lugs for mud, rock plate if the course turns technical after mile 33.
Race Day
Hold effort through mile 16. The field often splits on the first big climb after mile 33. Humid climbs, ridge exposure, and aid gaps in remote terrain near mile 43 is where time is won or lost. Walk the steep pinches. Run the flats and gentle downhills. Crew at major aids: socks, calories, ice if hot. Transitions under 5 minutes when possible. Final third is 22 miles of fatigue management. Finish with reserve for the last descent.
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