Top 10 Volcanoes on Jeju and the Korean Peninsula
The Korean Peninsula is mostly old, stable crust, sandwiched between the active arcs of Japan and the rifting margins of northeast China. But the region is not free of volcanism. Jeju Island, off the southern coast of South Korea, is a young basaltic shield with hundreds of cones. Mount Paektu, on the North Korean–Chinese border, is one of the largest known historic eruptions in human memory. These ten are the volcanoes that matter.
1. Hallasan (Mount Halla), Jeju
The defining Korean volcano. A 1,950-metre shield that makes up the bulk of Jeju island. Last erupted around a thousand years ago. The summit crater, Baengnokdam, holds a small seasonal lake and is one of South Korea's most iconic hiking destinations.
2. Jeju's parasitic cones (oreum)
Scattered across Jeju are roughly 360 small parasitic cones — oreum — formed during the island's long history of basaltic activity. Many are walkable in an hour, some are protected heritage sites, and a few hold their own crater lakes.
3. Seongsan Ilchulbong, Jeju
A spectacular tuff cone on the east coast of Jeju, formed by a shallow-marine hydrovolcanic eruption around 5,000 years ago. The summit, reached by a short hike, is one of the most photographed places in Korea, especially at sunrise.
4. Manjanggul Lava Tube, Jeju
Not a volcano in itself, but one of the longest accessible lava tubes in the world — a relic of the basaltic eruptions that built the island. Part of the Jeju UNESCO Geopark, with public access to a section of the tube.
5. Mount Paektu (Changbai), DPRK–China border
The largest historic eruption in East Asia. The 946 AD "Millennium Eruption" deposited ash across the Sea of Japan to Hokkaido and left an enormous summit caldera, now occupied by the deep Tianchi/Cheonji lake. Modern volcanic-monitoring cooperation between China and North Korea is patchy.
6. Ulleungdo
A volcanic island in the East Sea (Sea of Japan) about 120 kilometres east of the Korean mainland. A relatively young basaltic-trachytic shield rising sharply from deep water. Currently dormant; last erupted around 10,000 years ago.
7. Dokdo / Liancourt Rocks
Tiny eroded volcanic islets east of Ulleungdo, the remnants of an older volcanic edifice mostly submerged beneath the sea. Politically contested between Korea and Japan but geologically of similar style to Ulleungdo.
8. Northeast volcanic field
The far northeast of the peninsula has a small Quaternary basaltic field extending into Russian Primorye and the Chinese border region. Not visited by tourists, but a real component of Korean geological inventory.
9. Southwest field
Smaller late-Cenozoic flows and cones lie around the southwestern coast of South Korea. Most are heavily eroded and overlain by sediment, but they show that volcanism extended further than Jeju alone.
10. Submarine cones in Korean waters
Several submarine volcanic features — seamounts and possible guyots — sit off the south coast. Detailed bathymetric surveys in recent decades have mapped them in increasing detail. None are known to be currently active.
Two very different stories
Korean volcanism comes in two flavours. Jeju and Hallasan are oceanic basaltic shields, with frequent small eruptions over recent geological time. Paektu is a continental-scale stratovolcano with rare but cataclysmic events. The peninsula shows both ends of the volcanic spectrum.
How to visit
Hallasan and Seongsan Ilchulbong are accessible day trips from Jeju City and Seogwipo. Manjanggul is a half-day excursion. Ulleungdo is a long ferry ride from the mainland but extraordinary. Paektu access from the Chinese side (Changbai Mountain) is much easier than from North Korea.
See them on the map
Filter the map to Korea and the contrast appears immediately: Jeju glows with hundreds of small features in the south, while Paektu dominates the north as a single huge centre, and the peninsula in between sits on much older, quieter crust.