2027 Seoul Marathon (97th Dong-A Marathon) D-146

Segments

1. 0–5 km · 07:58

   Gwanghwamun Square → Sungnyemun → Eulji-ro → DDP

   Head down Sejong-daero to Sungnyemun (1.2 km), then take a near-hairpin turn onto Eulji-ro. The official profile puts the high point (about 34 m) near the gate and drops about 13 m to 4 km, so don't let the downhill and the crowd set your pace.

   +7 m −15 m · 1.2 Sungnyemun Gate – hairpin onto Namdaemun-ro 2.1 Euljiro 1-ga Station – onto Eulji-ro 4.9 Loop around DDP (Dongdaemun Design Plaza) 5.0 Water 5.0 Pocari Sweat
2. 5–10 km · 08:27

   DDP loop → Euljiro 1-ga → Gwanggyo → Cheonggyecheon-ro

   After looping around DDP you run Eulji-ro back west, then turn right by City Hall at 8.1 km onto Cheonggyecheon-ro. Corners come often and the official profile drops about 15 m here, so take the inside line at each turn but keep your pace even.

   +8 m −18 m · 7.5 Sponge 8.7 Gwanggyo – onto Cheonggyecheon-ro 10.0 Water 10.0 Pocari Sweat
3. 10–15 km · 08:55

   Cheonggye 4-ga → Cheonggye 8-ga → Gosanja Bridge U-turn → Cheonggye 9-ga

   Follow the Cheonggyecheon stream east, cross Gosanja Bridge and U-turn at 13.8 km, then come back on the other bank. The stream-side road is narrow and one-way, so the turn gets crowded, and the official profile climbs about 18 m slowly to 15 km; don't surge out of the U-turn.

   +18 m −0 m · 12.5 Sponge 13.8 Gosanja Bridge U-turn 15.0 Water 15.0 Pocari Sweat
4. 15–20 km · 09:24

   Cheonggye 7-ga → Cheonggye 3-ga → Gwanggyo → Jongno-gu Office junction → Jong-ro 2-ga

   Retracing Cheonggyecheon-ro west, the official profile drops about 19 m, a good stretch to settle back into pace. At 19.1 km you turn right and almost immediately right again onto Jong-ro, so be ready for the double corner.

   +1 m −19 m · 17.5 Sponge 19.1 Jongno-gu Office junction – onto Jong-ro 20.0 Water 20.0 Pocari Sweat 20.0 Snacks (items may change)
5. 20–25 km · 09:52

   Jong-ro 3-ga → Heunginjimun → Sinseol-dong junction → Dongdaemun-gu Office

   Wide, straight Jong-ro takes you east past halfway, around Heunginjimun Gate at 21.8 km and onto Cheonho-daero at the Sinseol-dong junction (23.1 km). It is almost flat, so lock in your goal pace here.

   +10 m −6 m · 21.8 Heunginjimun (Dongdaemun Gate) 22.5 Sponge 23.1 Sinseol-dong Station junction – onto Cheonho-daero 25.0 Water 25.0 Pocari Sweat
6. 25–30 km · 10:21

   Sindap Station → Janghanpyeong Station → Gunja Bridge → Gunja Station → Children's Grand Park Station

   Cheonho-daero stays straight past the Sindap underpass at 25.5 km (in 2026 masters ran through it), then crosses the Jungnangcheon stream on Gunja Bridge at 28.2 km. Turn right at Gunja Station (28.9 km) down Neungdong-ro; spend a little extra effort only on the bridge ramps.

   +7 m −10 m · 25.5 Sindap Station (elites over the underpass, masters through it) 27.5 Sponge 28.2 Gunja Bridge (Jungnangcheon stream) 28.9 Gunja Station – onto Neungdong-ro 29.8 Children's Grand Park Station – onto Gwangnaru-ro 30.0 Water 30.0 Pocari Sweat 30.0 Snacks (items may change)
7. 30–35 km · 10:49

   Gwangnaru-ro → Hwayang junction → Seongdong Bridge → Seoul Forest → Ttukseom-ro

   From Children's Grand Park Station Gwangnaru-ro heads west; turn left over Seongdong Bridge (Jungnangcheon) at 32.6 km and join Ttukseom-ro at the Seoul Forest entrance (33.6 km). It is flat, but fatigue sets in past 30 km, so tuck in behind other runners and keep your rhythm.

   +6 m −3 m · 32.5 Sponge 32.6 Seongdong Bridge (Jungnangcheon stream) 33.6 Seoul Forest entrance – onto Ttukseom-ro 35.0 Water 35.0 Pocari Sweat
8. 35–40 km · 11:18

   Yeongdong Bridge north end → Jamsil Bridge → Jamsil Station

   Ttukseom-ro rises about 10 m on the official profile before you cross the Han River on Jamsil Bridge from 37.6 km. The bridge is fully exposed to river wind, so run in a group, then come off it and turn right at Jamsil Station (40 km).

   +11 m −13 m · 37.5 Sponge 37.6 Jamsil Bridge north end – Han River crossing 39.7 Jamsil Bridge south end 40.0 Jamsil Station – onto Olympic-ro 40.0 Water 40.0 Pocari Sweat
9. 40–42.195 km · 11:30

   Jamsil Station → Jamsil Saenae Station → Sports Complex junction → Jamsil Sports Complex East Gate

   A flat, straight finish west along Olympic-ro. Turn right at the Sports Complex junction (41.9 km) and the East Gate finish is about 300 m on, so save your kick until after that last corner.

   +2 m −2 m · 41.9 Sports Complex junction

Pace

Even-effort splits: slower on climbs, a little faster on descents.

Print pace band

Weather

Prep

Good to know

• Race day is Sunday 21 March 2027, as stated in the official overview, rules and notices (2027 Seoul Marathon / 97th Dong-A Marathon).
• As of 2026-10-26 the 2027 course map is listed as 'to be published'. This page uses the 2026 course (Gwanghwamun Square → Jamsil Sports Complex). The 2027 full-marathon assembly area is again Gwanghwamun Square (planned), so the course is likely the same, but it will be re-checked once the official map is out.
• The 2027 start time has not been announced; assembly is 06:30 (planned). In 2026 Seoul city guidance moved the start from 08:00 to 07:30, and this page uses 07:30.
• Full-marathon waves start with the Hall of Fame (S) group, then A to H; timing is net. Starting from a group ahead of your own means disqualification, but moving back is allowed. In 2026 the corrals ran north along Sejong-daero behind the elite start line: Hall of Fame first, then A, B and so on.
• The 5-hour cut-off is strictly enforced, and roads reopen behind distance-based cut-offs. Per-point cut-offs for 2027 are not published. For reference, the 2026 traffic-control table reopened roads at Cheonggye 4-ga (10.1 km) 09:10, Jong-ro 5-ga (21.2 km) 10:28, Hwayang junction (30.2 km) 11:31, Jamsil Bridge north end (37.6 km) 12:22 and Jamsil Station (40 km) 12:40. These are road reopening time
• Aid: water and sports drink every 5 km (8 stations) and at the finish, sponges every 5 km from 7.5 km, and snacks at 20 and 30 km (items and locations may change). In 2026 each full-course station was about 135 m long with 25 tables, Pocari Sweat first and water after it.
• Medical support is described only as ambulances and medical teams at key points, so no medical km are listed. The 2026 map showed toilets near the aid stations, but check the 2027 guide for exact spots.
• Bag drop: in 2026 bags went in at Gwanghwamun 06:00–07:00 (arrive before 06:30) and came back at Jamsil 10:00–13:30. Changing rooms are at the assembly area. 2027 details are not out yet.
• Transport: neither Gwanghwamun Square nor Jamsil Sports Complex has parking, so take the subway. The start is next to Gwanghwamun Station (Line 5) and the finish next to Sports Complex Station (Line 2). In 2026 roads closed section by section from 05:00 to 14:30, and shuttle buses ran from Gwangju, Daegu, Daejeon and Busan (booked on T-money GO).
• Bibs and race gifts are posted to domestic runners before the race. Overseas runners must collect theirs in person at the 2027 Seoul Marathon Expo before race day.
• Late-March mornings in Seoul are cold: roughly 0–7°C around the start, with daytime highs near 10–15°C. Expect wind and possibly fine dust or yellow dust; bring a throwaway layer and gloves. Sunrise on 21 March is around 06:36 and civil dawn around 06:10 (NOAA solar algorithm), so it is light at the start.
• There is one U-turn (Gosanja Bridge, 13.8 km), a hairpin at Sungnyemun (1.2 km) and a loop around DDP (4.3–5.5 km). The course crosses the Jungnangcheon stream twice (Gunja Bridge 28.2 km, Seongdong Bridge 32.6 km) and the Han River once (Jamsil Bridge, 37.6–39.7 km).
• 2026 results were published on Runarchive (record.runarchive.com). Neither MyResult nor SPCT lists a 2027 Seoul Marathon event, so there is no live-tracking link.
• No official GPX exists, so the route is approximate. Compared with the intersection km table in the official 2026 traffic-control notice, 58 of 61 points are within 0.2 km. Elevation is taken from the chart on the official 2026 course map; it differs from satellite terrain data by more than 10 m in places, so treat it as a guide only.

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