Seoul 100K 2026
Seoul
100K 2026
Create & share your race with BackMyRun and your friends and family can send you motivational voice notes that play throughout your race.
Explore the
Seoul 100K
Seoul 100K brings a hilly trail ultramarathon to Seoul, South Korea, with the course coming alive on 20 Sep 2026. Runners can take on 104km, 51.50km and 23.40km options along a hilly course. With entry from 95 EUR and a warm welcome for eco-conscious runners, it's a standout on the regional calendar.
The Course Profile
Whether it is a trail road or a challenging city circuit, the route is designed to push your limits.
Athlete Support
Strategically placed hydration stations and cheering zones to keep your momentum high until the very end.
The Finish Line
A grand celebration awaits every finisher. Experience the roar of the crowd and earn your exclusive medal.
A premier international racing destination.
A trail course designed for peak performance.
104km, 51.50km, 23.40km
Experience the electric vibe from start to finish line.
Prepare for the
Seoul 100K Experience.
Race Day Readiness
Environment
Event Protocol
Official Timing
& Results
Electronic timing chips provide accurate race data. Be sure to follow all start-zone protocols for a valid finishing time.
Safety &
Participant Support
Dedicated medical and support teams are stationed along the entire course to ensure a safe environment for all athletes.
Global Standards
Seoul 100K World-Class Course
A professionally measured and sanctioned route designed to provide a premium racing experience in the heart of the city.
How Back My Run
Transforms Your
Seoul 100K.
We bridge the gap between runners and their supporters, turning a solitary challenge into a shared triumph through the power of voice.
Mental Strength at the Wall
When you hit the tough miles of the Seoul 100K, your phone triggers messages of encouragement exactly when your pace drops or you reach certain milestones.
Family Presence
Even if your loved ones can't be at the finish line in person, their voices will be right there in your ears, pushing you through every kilometer.
Global Support Network
Supporters from anywhere in the world can record their messages. Distance is no longer a barrier to being part of your Seoul 100K journey.
Lifetime Memories
After the race, you get to keep all those emotional voice notes forever. It's not just a race result; it's a collection of love and support.
From Start Line
To The Finish.
Experience the future of race-day motivation in three simple steps.
Download The App
Choose the Seoul 100K and create your event in less than a minute.
Collect Support Messages
Share your unique link with friends and family so they can record motivational voice notes for your Seoul 100K journey.
Run & Receive Motivation
As you reach key milestones in Seoul 100K, supportive voice messages automatically play through your headphones.
Start collecting Voice notes from friends and family!
Everything You NeedTo Know
Answers to common questions about using Back My Run for the Seoul 100K.
Support
is Confirmed!
Empower Your Runner In Seoul 100K
Don't just watch from the sidelines. Create a personalized motivational network that delivers your voice directly to their ears when they hit the target.