A Cool Summer Walk on Hallasan: Gwaneumsa Trail & a Hidden Natural Wind Hole
Living on Jeju, I barely go near the beach in summer. Too crowded, too much sun. Instead, I head for the mountains, and this time I chose the Gwaneumsa trail on Hallasan.
There's really one reason I'm writing about this route today. Partway through, there's a spot almost nobody notices — a natural air conditioner tucked into the rock. Sitting in front of that cool air, summer stopped feeling real. More on exactly where it is below.
I wasn't hiking to the summit. My destination was Tamnagyegok Valley, and everything about this walk was built around getting there slowly.
Tamnagyegok, the valley partway up this trail, is dry most of the year, and it was dry when I went too. But that's fine. The coolness of the forest and mountain air is enough on its own, water or not.
People assume Hallasan means a pre-dawn start. I left home around 10am, because this time I wasn't going for the summit — just Tamnagyegok Valley. In summer, I'd rather show that a gentle stretch of trail is plenty, without pushing for the top.
From the Gwaneumsa entrance to the wooden bridge, the path is flat forest walking with almost no incline — easy for anyone. Shade covers the trail the whole way, so it stays cool the entire time.
A Natural Air Conditioner Almost Everyone Walks Past
This is the part of the hike I most wanted to share. I hesitated for a second, honestly — half-worried this spot would get crowded once people knew. But good things are meant to be shared.
Walking the forest path, you'll pass a signboard that reads "Forest and Atmosphere." Turn left right at that sign and you'll find a pungyeol — a natural wind hole where cool air seeps out from cracks in the rock. It's close to the entrance, appearing before the "National Point Number 5-1" marker. There's no official signage pointing to it, so most people just walk by. I did too, for a while, before finally noticing it this time.
Cool air just flows straight out of the cave — a genuine natural air conditioner. I measured it myself: 15.9°C right outside the cave, 10.2°C just inside, a real difference. Humidity read 66%. I'd been sweating on the way down, so sitting in front of that air felt like I'd stumbled onto heaven. I honestly didn't want to leave. I think I sat there for a good 20 to 30 minutes.
Past the wind hole, National Point Number markers start showing up along the trail.
Gurin Cave — Once Used to Store Ice?
Keep walking a bit further and you'll reach Gurin Cave, a 442-meter lava tube with an entrance about 3 meters wide. Old Jeju records mention a rock cave on Hallasan that was once used to store ice year-round for the local government office. Some historians believe Gurin Cave may have been the lava tube mentioned in those old records, although it has never been confirmed. Traces of old dwellings and charcoal kilns have also been found nearby. According to the national park, it sits at the highest elevation of any cave on Jeju and is home to a range of cave-dwelling creatures and bats, giving it real academic value.
The Wooden Arch Bridge Is Enough for Most People
Keep going and you'll reach Mokgyo, an arched wooden bridge. Everything up to here is gentle enough for anyone, any age, to walk without strain. Just sitting on a bench near the bridge and taking in the forest air felt like plenty of a reset. A lot of people I saw turned back right here.
The Final Stretch to Tamnagyegok Valley
Past the bridge comes the one real challenge on this route — around 120 stone steps in a row. Climb those and you'll reach Tamnagyegok Valley itself. Then you'll find the restroom and a raised wooden rest platform waiting. If you need a restroom, or just want to sit longer, it's worth pushing through this stretch.
From the Gwaneumsa entrance to this restroom is about 3.2km, usually around 1 to 1.5 hours. We went slowly and rested at the bridge too, so it took us closer to 1.5 hours.
I climbed the stairs mostly for the exercise, ate the snacks I'd packed on the wooden platform, and headed back down.
You Don't Even Have to Hike
Near the Gwaneumsa entrance, there's a camping ground and rest platforms where plenty of people escape the heat without hiking a single step. I saw people stretched out on mats, families just sitting on the platforms passing the time.
You don't have to reach the summit to enjoy Hallasan. In summer, I'd actually recommend this route over anything higher up. Walk only as far as the bridge, or just sit in front of the wind hole and let the air do the work — either way, it's enough.
| 📍 Address | 588 Sanrokbuk-ro, Odeung-dong, Jeju City, Jeju Island |
|---|---|
| 🚶 To the wooden bridge | Gentle forest path, easy for anyone |
| 🚶♀️ To Tamnagyegok restroom | About 3.2km · 1 to 1.5 hours |
| 🚗 Parking | Public parking available (a new hourly-increment fee applies from 2026 — check the exact rate before you go) |
| 🏪 Shops | No shops along the entire trail — bring water and snacks |
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As a local resident of Jeju Island, I explore places in person and share my honest experiences, travel tips, and photos whenever possible. I continue to update my guides with new information and changes that may help your Jeju trip.
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