Hallasan, the volcanic heart of Jeju Island

Hallasan rises above Jeju in South Korea as a broad volcanic massif with a crater lake at its summit, shaping the island’s landscapes and ecosystems.

Hallasan dominates Jeju Island in South Korea as a broad volcanic massif whose summit crater lake crowns the highest peak in the country. The mountain’s shield-volcano bulk gives Jeju much of its distinctive terrain and underpins both its national park status and international recognition.

A shield volcano that built an island

Hallasan is a massive shield volcano occupying the centre of Jeju Island, its long, gentle slopes forming much of the island’s landmass.shield volcano The mountain rises to about 1,950 m (around 6,400 ft) above sea level, making it the highest peak in South Korea and the highest point on Jeju.highest mountain in South Korea The overall mass of Hallasan is largely composed of basalt, a dark volcanic rock typical of shield volcanoes in many parts of the world.basalt composition

Around the central cone, hundreds of smaller volcanic features dot the landscape. These secondary peaks, known locally as oreum, are parasitic cones that punctuate the flanks of Hallasan and extend across Jeju.oreum parasitic cones Together, the main volcano and its satellite cones create a varied topography of ridges, shallow valleys and lava-formed plateaus, giving travellers a clear sense that the entire island is the product of long volcanic activity.

Hallasan National Park and protected landscapes

The mountain and its surrounding slopes are protected as Hallasan National Park, a designation dating from 1970 that covers roughly 153 km² of central Jeju.Hallasan National Park Within this park boundary lie forested valleys, exposed lava outcrops and high moorland areas, all structured around the broad dome of the volcano. The national park forms part of a wider protected area recognised for its natural value, including an officially defined biosphere reserve under UNESCO’s Man and the Biosphere Programme.UNESCO Biosphere Reserve

The protected status reflects the diversity of life on Hallasan’s slopes. Surveys have identified well over 1,000 plant species and several thousand animal species, including many insects, distributed along elevation bands that change from lowland woodland to subalpine vegetation near the summit.vertical ecosystem of plants This vertical progression is a visible feature of any ascent: broad-leaved trees at lower levels gradually give way to conifers and shrubs, and higher up the vegetation becomes sparser, exposing more rock and volcanic soil.

Summit crater and hiking trails

At Hallasan’s summit lies Baengnokdam, a crater that holds a lake and forms a natural focal point for the mountain.Baengnokdam crater lake The crater rim encircles the water and offers broad views over Jeju’s surrounding landscape when conditions are clear. The basin itself shows exposed lava layers and weathered rock, a reminder of the volcano’s past eruptions even though Hallasan is now classed as dormant.dormant volcano

A network of marked hiking trails climbs the flanks of Hallasan through forest belts and open slopes. Routes such as Seongpanak and Gwaneumsa lead from lower elevations towards the high ridge and crater area, while shorter paths like Yeongsil, Eorimok and Donnaeko explore different aspects of the park’s scenery.named hiking trails Trail surfaces range from compacted earth and roots in the woodland zones to stone or timber steps on steeper sections, with boardwalks across some sensitive high moorland, so an ascent involves continuous walking on uneven ground and sustained gradients.

Visiting Hallasan: what travellers from Western Europe should know

• Hallasan stands in the centre of Jeju Island in South Korea, with trailheads such as Seongpanak and Gwaneumsa reached by road from Jeju City and Seogwipo.
• Walking on Hallasan involves extended ascents on sloping paths, long staircases in places and sections of rough volcanic rock, demanding sure footing and steady pacing.
• The mountain lies on Jeju Island in South Korea; the official language is Korean and the currency is the South Korean won.
• Hallasan is outside the UK, Ireland and the EU. Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.

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Frequently asked questions about Hallasan

Where is Hallasan located?

Hallasan is in the centre of Jeju Island, off the southern coast of mainland South Korea, and forms the core of Hallasan National Park.

What can travellers expect on a visit to Hallasan?

A visit to Hallasan involves walking on mountain trails through changing vegetation zones, with sustained climbs, staircases on steeper sections and views of volcanic scenery.

What makes Hallasan distinctive among South Korean mountains?

Hallasan is distinctive because it is a large shield volcano whose summit crater lake, extensive parasitic cones and broad protected ecosystems together create Jeju’s characteristic landscape.