Seoul was founded in 1394 inside a wall, and the wall is still there. The Hanyangdoseong — the Seoul City Wall — runs 18.6 km over four small mountains that ring the old capital, and roughly seventy per cent of it survives. The path that follows it, the sunseong-gil or wall-circuit trail, is the single best introduction to how Seoul is put together.
It is also the clearest example of a Korean dulle-gil. You cross four peaks, but none of them is the objective — the wall is. You are walking a perimeter, and the city is on one side of you the whole way.
The four inner mountains
Joseon planners chose the site because four mountains enclose it. These are the naesasan, the inner four, and the wall links them.
- Baegaksan (백악산, also called Bugaksan) to the north — the highest point on the circuit and the steepest climbing
- Naksan (낙산) to the east — the lowest and gentlest, a residential hillside
- Namsan (남산, historically Mongmyeoksan) to the south — the one with the tower on it
- Inwangsan (인왕산) to the west — granite slabs and the best rock scenery of the four
The six sections
| Section | Distance | Time | Exertion | Shade | Character |
|---|---|---|---|---|---|
| Baegak | 4.7 km | ~3 h | High | Partial | Steepest. Stairs, ridge, the best city panorama |
| Naksan | 2.1 km | ~1 h | Low | Partial | Easiest. Wall through neighbourhoods, good at dusk |
| Heunginjimun | 1.8 km | ~1 h | Low | Street-level | Flat, urban |
| Namsan (Mongmyeok) | 4.2 km | ~3 h | Moderate | Good — wooded | Long steady climb to the tower |
| Sungnyemun | 1.8 km | ~1 h | Low | Street-level | Flat, city centre, fragmentary wall |
| Inwangsan | 4.0 km | ~2 h 30 | Moderate–high | Very little | Granite, exposed, dramatic |
Distances and times follow the published figures for the wall circuit. Exertion and shade are our editorial assessment for trip planning, not measurements. If a clinic has given you activity restrictions, read these against that advice — see treatments that don’t cost you a hiking day.
Walked end to end that is around twelve hours, which almost nobody does in one go. The circuit is designed to be taken a section at a time, and every section begins and ends near a subway station.
Which section to walk
If you have one half-day and reasonable fitness: Baegak. It is the hardest section and the most rewarding — a ridge walk directly above the palace district with the whole city laid out below.
If you want scenery without stairs: Inwangsan. Bare granite, wide views west, and shorter sustained climbing than Baegak.
If you have two hours or it is hot: Naksan. Two kilometres, barely any climb, the wall running between houses and cafés. Locals walk it in the evening for the lights.
If you are combining it with sightseeing: Heunginjimun or Sungnyemun. Flat, central, and they connect the surviving gates.
The gates
The wall had four great gates and four smaller ones, named on a Confucian scheme of virtues.
- Four great gates — Heunginjimun (east), Donuimun (west), Sungnyemun (south), Sukjeongmun (north)
- Four small gates — Hyehwamun (east), Souimun (west), Gwanghuimun (south), Changuimun (north)
Sungnyemun and Heunginjimun still stand at major intersections and are Korea’s National Treasure No. 1 and Treasure No. 1 respectively. Donuimun was demolished during the colonial period and exists only as a marked site — a gap in the circuit you walk straight past.
Practical notes
- Access — the Baegak section sits behind the presidential district and has historically had restricted hours and identity checks. Access rules have been relaxed in recent years but still change; check the current notice before you plan that section specifically.
- Shoes — Naksan, Heunginjimun and Sungnyemun are fine in trainers. Baegak and Inwangsan involve long stair flights and granite; take grip.
- Water — buy it before you start. There is little on the ridge sections.
- Timing — Naksan and Namsan are popular at sunset. Baegak and Inwangsan are better early.
- Direction — the circuit is conventionally walked clockwise from Heunginjimun, but any section works in either direction.
Where to go next
- Hiking in Korea — why the mountains here are day-sized
- What a dulle-gil is — the format this trail belongs to
- Galmaetgil — Busan’s coastal equivalent
In an emergency
Korea has two emergency numbers, and both answer in English.
- 119 — fire, rescue and ambulance. This is the one to call for an injury on a trail.
- 112 — police.
Korean trails carry numbered rescue markers — small posts with a code on them. Reading that code to the operator locates you far faster than describing the scenery. Note the last one you passed.
Mobile coverage is good on almost all the routes described here, including the ridges.
Section access, opening hours and restoration closures change. Distances and times follow the published figures for the wall circuit; confirm current access with the managing authority before setting out.
Closures are the thing worth checking
Korean trails close, and not only for weather. National park ridgelines shut during the spring and autumn fire-risk periods, coastal sections close for construction or erosion, and some routes run on fixed opening hours rather than dawn to dusk. These are published by the managing authority and almost never by the blogs describing the walk.
Distances and difficulty ratings are worth taking from the official course data too. The national walking trail portal publishes track files and an assigned difficulty grade, which is a steadier basis for planning a day than someone else’s impression of how hard it felt.