Races
Transjeju
Jeju Island. Volcanic oreums. Hallasan views. One hundred seven kilometers of Korean island trail.
69 mi+5,761 ft-6,184 ft25 hours1,465 ft to 2,111 fttech 5/10Checkpoints per race bookJeju oreumsvolcanicWSER qualifierOctober
Distance69 mi
Gain+5,761 ft
Loss-6,184 ft
Altitude1,465 ft to 2,111 ft
Technicality5/10
Air50°F to 75°F
- Start1,906 ft
- High2,111 ft
- Low1,465 ft
- Finish1,483 ft
Geometryderived
Steepest drop627 ft-6.1% over 2.0 mi
Night miles32 misunset near 17:00 local
The cruxHallasan flank trails and oreum climbs in October wind (near mile 43)
Course DNA
The Course
Transjeju runs 107 km through Jeju Island, South Korea. +5,761 ft gain and -6,184 ft loss. Surfaces skew 70% trail / 25% oreum path / 5% road. Hallasan flank trails and oreum climbs in October wind. High point near 2,111 ft. Low near 1,465 ft. October temps run 50°F to 75°F. The course rewards patience early and punishes rushed descents after mile 33.
The Work
Train for 5,761 feet of climbing across 107 km. Back-to-back long runs on trail. Practice power-hiking grades above 15 percent. 25 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
October in Jeju Island, South Korea: plan for 50°F to 75°F. Mandatory shell if rain is in forecast. Headlamp with spare batteries if 25 hours pushes past dark. Poles help on sustained climbs above mile 17. Vest capacity for 2 liters minimum. Shoes matched to 70% trail: lugs for mud, rock plate if the course turns technical after mile 33.
Race Day
Hold effort through mile 17. The field often splits on the first big climb after mile 33. Hallasan flank trails and oreum climbs in October wind 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.
Results
Transjeju finish lines.
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