Wonsusan Mountain Dalme Observatory
Located at the summit of Wonsusan Mountain (251 m above sea level) in Sejong-dong, Sejong City, this observatory offers a panoramic view of the Administrative City, stretching from the Geumgang River and Sejong Lake Park in the south to the Miho River in the north. It is a popular nearby hiking destination among Sejong residents, accessible in about an hour via a 3 km round trip from the Deokseong Seowon parking lot.
The 1293 Yeongi Victory and How Wonsusan Got Its Name
The name Wonsusan is believed to have originated when Goryeo forces, under the command of General Han Hui-yu, commander of the Left Wing Army, annihilated the Mongol Hapdan invaders in 1293, during the reign of King Chungnyeol of Goryeo. The invaders had been defeated in the first battle at Ssangjeon-ri, Yeonseomyeon, fled across the Geumgang River, and were guarding against a renewed attack when they were defeated. The mountain is thought to have been named after the general. However, the year of the invasion varies slightly among sources. Some records state that the name derives from the “Great Victory at Yeongi,” in which the three generals Han Hui-yu, Gim Heun, and In Hu defeated the Hapdan forces in 1291, also during the reign of King Chungnyeol. The Sinjeung Dongguk Yeoji Seungram records that Wonsusan lies 5 ri south of the county seat, while the Yeojidoseo (Yeongi) records that its mountain range extends from Musing-san in Gongju.
This mountain has also been called Hyeongjebong, Jag-eun Hyeongjebong, Keun Hyeongjebong, and Bumosan. It also has the nickname Munpilbong because its pointed peak resembles the tip of a brush. The memory of battle is not all that remains here. At Sanjedang Shrine on the middle slope of Wonsusan in Sejong-dong, a mountain spirit ritual praying for the village’s peace and safety has continued for hundreds of years, held every year at the hour of the Rat on the second day of the winter month. According to legend, when an epidemic spread through the village, a passing ascetic advised the residents to build Sanjedang Shrine and hold the ritual every year, after which the illness disappeared. However, when Sejong Special Self-Governing City was established, all the villagers living below the mountain moved away, and many of the old records kept at Sanjedang Shrine were lost.
What You Can See from the Summit Observatory — From the Geumgang River to Iungdari
An observatory and resting area have been installed at the summit of Wonsusan. Looking around, the Geumgang River flows to the south, Jeonwolsan lies to the east, Guksabong to the west, and the Miho River surrounds the mountain to the north. Lowering your gaze reveals Sejong City landmarks to the south, including Sejong Lake Park, the National Sejong Arboretum, Central Park, and the Geumgang Pedestrian Bridge (Iung Bridge), while apartment complexes in the city’s various residential districts can be seen to the east. The mountain is also known as a popular spot for viewing the city’s night scenery.
The current observatory was not part of the original facilities. Because the summit area of Wonsusan is small and offered little space for enjoying the view or resting, the National Agency for Administrative City Construction and the Korea Land and Housing Corporation (LH) Sejong Special Headquarters responded to visitors’ requests and improved hiking amenities at the summit in December 2016. Sources differ slightly on the elevation, but most media outlets list it as 251 m. Hikers commonly take commemorative photos at the summit marker before descending in a loop toward Deokseong Seowon. As this is an urban natural park open at all times without an admission fee or closing hours, visitors can climb it at any time around sunrise.
From the Deokseong Seowon Parking Lot to the Summit: 3 km Round Trip, 1 Hour
The most frequently used access route is the Deokseong Seowon course. Follow a level forest path, pass the fork for Sejong Fire Station and the Wonsusan summit, and cross a deck bridge over a mountain-bike course. Soon afterward, a steep, uneven, gravelly uphill section begins. Some sections require careful climbing while holding the safety ropes after passing the Wonsusan Origin Monument. The summit is reached after climbing the roughly 300 m steep slope for about 10 minutes, and it takes approximately 30 minutes to walk from the Deokseong Seowon parking lot to the summit.
The descent is generally gentle except for the steep sections and can be enjoyed like a walk. The full out-and-back hike is 3 km and takes about one hour. Sungdeoksa Temple at the trailhead was established as a shrine in Heungwon-gun, Hamgyeong Province, in 1885 to honor Im Heon-hui, who served as a Vice Minister of Personnel and Chief State Censor during the Joseon period. In 1978, more than 1,000 Confucian scholars from across the country restored the shrine in Sejong-dong, the site of Im Heon-hui’s former residence. In 1990, local Confucian scholars established Deokseong Seowon here. Sungdeoksa Temple is currently designated as a local cultural heritage site of Sejong City.
Wetland Ecological Center and Parangsae Children’s Forest Experience Center — A Walk with Children
Park at Deokseong Plaza and walk uphill along the hiking trail for about 10 minutes to reach the Wonsusan Wetland Ecological Center. Created by ecologically restoring old rice paddies, this wetland center held its opening ceremony on August 31, 2016, and was opened to Sejong City’s 240,000 residents. Twenty-six species of ornamental plants, totaling 100,000 plants, were planted, and an observation deck and ecological education center were added. Covering approximately 20,000 m², it features various wetland environments, including aquatic-plant wetlands, dry wetlands, and small ponds. Visitors can experience and study the ecosystem from the observation deck crossing the wetland. At the “2017 BioBlitz Sejong” held here in 2017, 243 plant species, 58 insect species, 5 amphibian species, and 3 reptile species were observed.
Near the wetland center, Sejong City’s first children’s forest experience center, Parangsae Children’s Forest Experience Center, officially opened, allowing children to encounter nature in more diverse ways. After more than 4,500 young children visited during the pilot operation, it officially opened on March 12, 2018, and has since become one of the representative attractions of the administrative city. On weekdays, it operates twice daily, from 10:00 to 11:30 a.m. and from 2:00 to 3:30 p.m., mainly for kindergartens that have applied for regular, hands-on, or self-guided programs.
Sunsets and Night Views, Along with Frozen Rocky Paths in Winter
A visit report by the Sejong City Blog Reporters describes setting out in the late afternoon from the parking lot below the Wonsusan Wetland Ecological Center, passing through the wetland center, and heading to the summit in order to see both the sunset and the night view in one trip. An autumn visit report also mentions Wonsusan as a mountain where visitors can see autumn foliage.
Caution is necessary in winter. A visit report from early 2021 describes repeatedly slipping while climbing because the shoes were unsuitable, even on sections without a particularly steep incline. Other hikers were reportedly carrying boots, crampons, and hiking poles. Visitors have also reported that Wonsusan has many branching paths and is easy to get lost on if you take a wrong turn, so first-time hikers should check the signposts frequently for safety.
Opening of the Circular Trail in 2025 and Remaining Challenges
Sejong City Hall announced through its official bulletin that the circular trail (deck road) within Wonsusan Neighborhood Park, developed by the LH Sejong Special Headquarters, would open at 9:00 a.m. on January 24, 2025. Earlier, a forest adventure playground of approximately 500 m² had been built above the wetland center, equipped with tree houses, suspension bridges, and slides.
However, some areas still need improvement. Wonsusan contains the wetland center and Dalmaetteul Neighborhood Park and is considered one of the city’s most popular attractions for residents and families. Nevertheless, there has been criticism that follow-up cleanup was not properly completed even 10 years after the large number of graves—tens of thousands—that had been scattered around Wonsusan during the construction of Sejong City were relocated. In fact, some former burial sites remain as depressions in the ground, while memorial stones and stone grave furnishings have been found abandoned around the hiking trails.
How to Get There and What to Check Before Your Visit
Wonsusan is an urban neighborhood park without a ticket booth or entrance gate, so it can be visited free of charge. The hiking trails have no separately designated opening or closing hours, allowing access at all times. Sejong City Hall regularly posts facility information, including news about the opening of the Wonsusan circular trail, in the announcements section of its website. It is therefore advisable to check the Sejong City Hall website (sejong.go.kr) before visiting. The representative access-point parking lot at Deokseong Seowon and the parking lot near the Wonsusan Wetland Ecological Center are free to use.
Because Sejong City has no urban railway, local buses or private cars are the usual means of transportation. For safety, check the specific bus routes again through the Sejong City Transportation Information System before your visit. Much of the hiking trail consists of dirt and forest paths, making it difficult to reach the summit with a stroller or wheelchair. However, the observation deck at the wetland center is level, so visitors with children or older adults may choose to explore only the wetland center and children’s forest experience center instead of climbing to the summit. If planning the entire outing, allow about one hour for a round trip to the summit from the Deokseong Seowon parking lot, or two to three hours if also visiting the wetland center and children’s forest experience center.
Before You Go
- Hours
- Open at all times (an urban neighborhood park without a separate entrance gate or opening and closing hours; a flashlight is recommended at night because lighting facilities are limited)
- Admission
- Free (no ticket booth)
- Official site
- https://www.sejong.go.kr
- Transport
- No urban railway in Sejong City. Deokseong Seowon and the area near the Wonsusan Wetland Ecological Center can be reached by local bus; check specific routes through the Sejong City Transportation Information System
- Parking
- Parking available at Deokseong Seowon and near the Wonsusan Wetland Ecological Center (free)
- Time needed
- About 1 hour for a round trip to the summit (3 km); 2–3 hours including the wetland center and children’s forest experience center
- Accessibility
- Steep gravel sections near the summit make wheelchair and stroller access difficult. The observation deck at the wetland center is level
The information above is accurate as of the time of writing. Check the official information again before visiting.
Places
Nearby Attractions 5
-
1
-
2
Wonsusan Wetland Ecological ParkWalk along the observation decks and observe the wetland ecosystem and plants. -
3
Parangsae Children's Forest Experience CenterA space where children can enjoy forest play and nature experiences. -
4
-
5
Food & Dining 5
-
6
Songdo Galbi Sejong BranchA Korean barbecue restaurant serving charcoal-grilled galbi with a full traditional table setting. -
7
Bapsang Charyeo-juneun JipEnjoy a full Korean table d’hôte meal served with a variety of side dishes. -
8
Hain Seonsaeng Sejong BranchA restaurant specializing in upscale Chinese cuisine, centered around course meals. -
9
Seongsanok – Sejong Arts Center BranchA Korean restaurant serving Pyongyang-style naengmyeon and eobokjaengban, a traditional Korean platter dish. -
10
Jinju Naengmyeon NamgaokA restaurant specializing in Jinju naengmyeon, topped with yukjeon garnish.
More Travel Guides in This Area
Korea News
![ZEROBASEONE ‘ZEROBASEONE Shining Even at Night!’ [★Video]](https://kotourlive-images.s3.ap-northeast-1.amazonaws.com/news/1786629298196_13d8a4bb_news_075face7-fb4e-402c-b833-25ccaf88cf8f.jpg)
News
ZEROBASEONE ‘ZEROBASEONE Shining Even at Night!’ [★Video]
News
Kwon Eun-bi, First Comeback Since Moving from Woollim to RBW: “Aiming for a September Release”
News
“Did Jungkook’s connection continue?” Pop star Usher spotted warmly hugging BTS’s RM and J-Hope
News