Manjanggul Lava Tube

Character

Manjanggul reads as frozen movement. The tube formed when lava from Geomunoreum kept flowing beneath a cooling crust; after the molten interior drained away, the long conduit remained

The walls still record that motion. Lava flow lines mark former current directions, shelves preserve earlier levels of the molten stream, and broken crust hardened into rafts and other forms inside the tube. These features appear in sequence along the visitor route, so the cave explains itself through its surfaces

The scale changes repeatedly. Manjanggul extends roughly 7.4 kilometres and reaches about 25 metres in height and 18 metres in width at its largest points, yet general visitors enter through Entrance 2 and see only about one kilometre. Most of the cave remains outside the public route

The experience

The public path now runs on a continuous deck installed during the 2024–2026 safety works. After the entrance stairs, the route carries visitors through the tube while lower-intensity LED lighting reveals wall textures, old lava levels and changes in ceiling height without lighting the entire chamber at once

The clearest endpoint is the lava column, about 7.6 metres high. It formed where lava from an upper passage dropped into the lower tube and accumulated vertically. Nearby lava toes preserve the end of that downward flow, making the cave’s multi-level structure visible in one concentrated section

Manjanggul also supports cave habitat beyond the tourist path. Official Jeju tourism records 38 cave-dwelling species and past surveys of a large bent-wing bat colony near Entrance 3. That section is separated from the visitor route, so the ecological importance of the tube extends well beyond what can be seen on an ordinary visit

History

The cave was known locally before modern tourism, but a systematic exploration in 1946 brought it wider attention. Teacher Bu Jong-hyu organized a group of students from Gimnyeong National School into exploration, torch, supply, measurement and record teams and surveyed the cave with very limited equipment

In 2007, Manjanggul became part of the UNESCO World Heritage-listed Jeju Volcanic Island and Lava Tubes through the Geomunoreum Lava Tube System. UNESCO identifies the system as an exceptional volcanic record because of the scale, preservation and variety of its lava-tube formations

A rockfall near the entrance on December 29, 2023 closed Manjanggul completely. The subsequent project added rockfall protection, a continuous visitor deck, new lighting and monitoring equipment. The cave reopened on May 30, 2026 after about two and a half years

The closure changed the visitor infrastructure, not the geological story. The tube is ancient, while the rock around the public route still requires continuous inspection for cracks, vibration and rockfall risk

Before you go

The public visit begins at Entrance 2 and covers an approximately one-kilometre out-and-back route to the lava column. The rebuilt deck makes the public section much easier to walk than before the 2023 closure; the entrance still begins with stairs, and the cave remains cool year-round