Create Race Event or a Route?

Not sure which to choose? Read this. Creating a race event allows you to group together multiple courses under a single event and provides additional features when embedding. Routes on the other hand are convenient for simpler circumstances.

Find race
Pricing
Log in
Sign up

Find a race

Advanced search filter

TransJeju by UTMB Seogwipo-si, Jeju, South Korea

Name: TransJeju by UTMB
Start: 2027-09-24
End: 2027-09-25

Find race
TransJeju by UTMB

Course maps

Download GPX Email GPX Export to Garmin Export to Wahoo

You must be a user to perform this action

The action you requested requires that you be signed in. If you don't have an account, signing up is easy, just click the "Sign up" button below. And we don't do anything creepy like sell your data or spam you to oblivion with nonsense. (We hate that stuff too.)

Before you continue

HelloDrifter does not warrant the accuracy of this course data; it is provided for informational use only. Verify the course against the event organizer's published materials before relying on it for navigation or safety-critical activities.

Heads up: this course is not currently managed by a race director. Check with the event organizer for any last-minute changes before you rely on it.

By continuing, you accept the site's terms and conditions.

Embed

Edit the course Edit POIs Course cuesbeta

Route source

You must be a user to perform this action

Access to our embedded maps features is reserved for our users. Plese sign in or sign up using one of the links below.

Jeju20K
Jeju60K
Jeju100K
Jeju100M

Foot race | 25 Sep 2027

12.1 mi

Distance

Elevation gain

1,483 ft

Elevation high

958 ft

Elevation avg

Unspecified surface

Elevation loss

702 ft

Elevation low

11%

Climb factor

What is climb factor?

The climb factor for a course is the percentage of your energy used in hill-climbing compared to the energy expended running the flats.

This course has a climb factor of 11% over 12.1 mi, which means that the energy expenditure for the run is equivalent to running a flat 13.4 mi.

Climb factor is provided courtesy of Ben Crowell, who both authored climb factor's scientific paper and wrote the open source software for it. You can read more about it here .

Course last updated 10 Oct 2026

All values approximate

Distance & elevation data

The distance or elevation data not precisely what you expect for this route?

Data from a GPS device can be rough, especially in areas where the terrain (trees, canyons) interfere with GPS signals. And routes drawn on our maps are reliant on people marking trails from satellite images -- the details of which can be hidden by trees.

Elevation can be tricky too. Elevation data is stored on spaced topographical lines, and determining the elevation of a point requires computers to estimate based on how close the point is to the topographical line.

We mitigate this by calculating distance in 3-D (think Pythagorean theorem) and using mathematical techiniques to smooth the elevation data. We come close, but no one can be perfect with imperfect data, even in 2026.

Subscribe to build and embed our maps for personal or commercial use.View plans.

Subscribe to HelloDrifter

Select subscription type

Pro

Embed & share WebGL maps for your events.

Starts at $7/mo.

Basic

Create & view WebGL maps for personal use.

Stats summary

Race distance	Distance	Ele gain	Ele loss	Ele avg	Paved	Gravel	Dirt	Narrow
Jeju20K	12.1 mi	1,496 ft	1,490 ft	958 ft	100%	0%	0%	0%
Jeju60K	38.3 mi	4,859 ft	5,486 ft	1,332 ft	100%	0%	0%	0%
Jeju100K	64.1 mi	13,789 ft	13,786 ft	2,379 ft	100%	0%	0%	0%
Jeju100M	92.1 mi	16,699 ft	16,696 ft	1,955 ft	100%	0%	0%	0%