Location and surroundings
Hallasan rises in Seogwipo-si on Jeju Island, within South Korea. It belongs to the wider chain East Asia > Korean Peninsula > Jeju Island. With an elevation and prominence of 1,947 m, it is the highest of the 148 named peaks on Jeju Island and the highest point of South Korea. The mountain forms the island’s central high ground, with volcanic slopes, ridges and cones spreading outward in every direction.
Neighbouring peaks
Hallasan is surrounded by many nearby volcanic peaks and passes, but it remains the dominant summit in the area. The closest are all lower than Hallasan and sit on its flanks or just beyond them:
- Utbang-E-Oreum — 1,747 m, 0.5 km south
- Janggumok-Oreum — 1,813 m, 0.6 km northwest
- Wisse-Oreum — 1,741 m, 0.8 km west
- Bang-E-Oreum — 1,699 m, 0.8 km south
- Wanggwalleung — 1,551 m, 1.0 km north
- Wanggwanneung — 1,667 m, 1.1 km north
- Samgakbong — 1,697 m, 1.3 km north
- Wisse-Nu-Eun-Oreum — 1,712 m, 1.4 km west
These neighbours show how densely volcanic the island is, but none approaches Hallasan’s height or prominence.
The view from the summit
From the summit area, the highest nearby peaks within 25 km are mostly other Jeju volcanic cones. The main ones are Wisse-Jogeun-Oreum to the west at 1,700 m, Keundurewat to the north at 1,631 m, and Albang-E-Oreum to the south at 1,585 m. Farther out are Sajebidongsan to the west, Heukbulgeun-Oreum to the northeast, and Seongneol-Oreum to the east.
Even with many high cones around it, Hallasan still rises above them all. The summit view is shaped by the island’s volcanic relief rather than by distant mainland ranges.
The range
Hallasan belongs to the broad range hierarchy East Asia > Korean Peninsula > Jeju Island. Jeju Island is the narrowest unit in that chain, and Hallasan is its high point. The mountain is also the highest point of South Korea. Within Jeju Island, it ranks first by elevation among 148 named peaks, which underlines how completely it dominates the island’s topography.
The island itself is volcanic, so the “range” here is less a line of separate mountains than a volcanic landscape built around one central massif and many smaller cones.
Volcanic activity
Hallasan is a shield volcano made of basalt and trachyte lava. Geological evidence suggests its last eruption was at least 2,000 years ago, while historical records in the Goryeosa place the last eruption in 1007 CE. That means it is treated as an active volcano because it has erupted within the last 10,000 years, although the active status is not universally agreed and further study is still needed.
The summit crater, Baengnokdam, is a major volcanic feature of the mountain and one of the clearest signs of its eruptive past.
Climbing routes and access restrictions
The usual summit approaches are the Seongpanak Trail and the Gwaneumsa Trail. Seongpanak is the longer, steadier ascent, while Gwaneumsa is steeper and more scenic. Other trails such as Eorimok and Yeongsil are useful for the upper slopes and western side, but they are not normal summit routes in standard conditions.
Access is regulated: the summit trails of Hallasan on Jeju, especially Seongpanak and Gwaneumsa, require a free advance online reservation, and daily numbers are capped. That makes planning ahead essential, especially in busy periods.
Climate and weather
The summit climate is cool for the latitude but not severe by alpine standards. Using NASA POWER climate data, the warmest month at the summit is about 15 °C in August, and the coldest is about 2 °C in January. Around the mountain, annual precipitation is about 1,550 mm, with August the wettest month at about 260 mm and January the driest at about 50 mm.
Weather hazards on Hallasan include fog, strong wind, sudden cloud cover and wet rock, especially when summer rain and coastal weather systems move across Jeju Island.
Best time to visit
At the summit, mean temperatures stay above freezing in every month, so the mountain can be visited year-round if conditions and access rules allow. The drier months are generally winter and early spring, while late summer is the wettest period. For clearer and more comfortable hiking, many visitors prefer the cooler, less rainy parts of the year rather than the humid summer months.
Even in mild weather, the summit can feel much colder than the coast because of wind, cloud and elevation, so layers are useful in every season.
Nature and wildlife
Hallasan National Park protects a volcanic mountain landscape with forested lower slopes, alpine-like upper ground, crater terrain and many oreum, the local name for volcanic cones. The soils are volcanic ash, sand and lapilli, with high organic content but limited fertility. That supports a varied plant cover adapted to wet, windy conditions and changing elevation.
The mountain is part of a protected natural reserve as well as the national park, so the landscape is managed more carefully than an ordinary hiking area. Wildlife on Jeju’s high ground is shaped by the island setting and the mountain’s steep climatic gradient.
Guides and organised ascents
In South Korea, mountaineering visitors commonly turn to the Korea Alpine Federation (KAF) and to established guiding companies such as Hike Korea. The country’s alpine federation is the main national mountaineering body, and guided trips are usually arranged through local operators rather than by fixed hut systems. For Hallasan, the more important issue is often permit planning rather than technical guiding.
Hallasan’s summit trails require a free advance reservation with capped daily numbers, so organised ascents should be booked early. A guided outing typically helps with route choice, timing and logistics, especially for visitors unfamiliar with Jeju’s weather and access rules.
Safety and preparation
Hallasan is a high volcanic mountain with long hiking routes, changeable weather and exposed summit conditions. Even though the elevation is moderate by global alpine standards, the combination of distance, wind, rain and cloud makes it a serious day hike. Good footwear, warm layers, rain protection and enough food and water are important, and the summit area can feel much colder than the coast.
For mountain rescue in South Korea, call 119; police are reached on 112. Mobile coverage is often usable on open ground, but it can weaken in gullies and forested sections.
History and name
Hallasan is also known as Hanla Mountain, Mount Halla, and in older English sources Mount Auckland. The mountain has had several Korean names over time, including Buak, Wonsan, Jinsan, Seonsan, Dumuak, Burasan, Yeongjusan and Hyeolmangbong. The name is written in Hangul in a form that looks like Hanrasan, but it is pronounced Hallasan.
The mountain and its natural reserve were designated as a South Korean Natural Monument in 1966. In local tradition, Hallasan is closely tied to Jeju Island itself, and the two are often spoken of as one landscape.
Interesting facts
Hallasan has a prominence equal to its elevation, 1,947 m, because it rises from the island as the highest point of the country. It is the highest of 148 named peaks on Jeju Island and the island’s high point. The summit crater lake, Baengnokdam, is one of the mountain’s defining features, and the flanks contain about 360 parasitic cones, or oreum.
The mountain is often treated as the central symbol of Jeju Island, and in clear weather it can be seen from many parts of the island, although the summit is frequently cloud-covered.
FAQ
How high is Hallasan? Hallasan rises to 1,947 m, making it the highest mountain in South Korea and the high point of Jeju Island.
Where is Hallasan? It is on Jeju Island in Seogwipo-si, South Korea, within the broader East Asia > Korean Peninsula > Jeju Island mountain hierarchy.
What are the nearest peaks to Hallasan? The closest are Utbang-E-Oreum to the south, Janggumok-Oreum to the northwest, and Wisse-Oreum to the west, all within 1 km.
Is there water on the way to Hallasan? Plan to carry your own supply. The mountain is high, exposed and often wet, but water sources are not something to rely on for a summit hike, so 1.5–3 litres is a sensible range depending on heat and route length.
How long does it take to hike Hallasan? The Seongpanak Trail is typically about 9.6 km one way and the Gwaneumsa Trail about 8.7 km one way. Strong hikers often need around 4–5 hours from Seongpanak and 5–6 hours from Gwaneumsa to the summit area, with round trips commonly taking 7–9 hours.
Do I need a reservation to climb Hallasan? Yes. The summit trails on Jeju, including Seongpanak and Gwaneumsa, require a free advance online reservation and daily numbers are capped.
How is mobile phone coverage on Hallasan? Coverage is generally good on much of the mountain and near the summit, but it can be patchy in gullies and forested sections. Emergency calls to 112 reach services over any available network, and it is wise to download maps before setting out.