Rising 1,950 meters above sea level, Halla-san is the central volcanic mountain peak of Jeju Island. About 360 parasitic volcanoes surround Halla-san's base, the largest number of such volcanoes that has been found around any single mountain peak. Halla-san is famous not only for the uniqueness of its geographical formation but also for its ecological diversity. The combination of high mountain peaks, oreums (parasitic volcanoes), caves, and beaches make for numerous and various environmental habitats.
A variety of plants and animals can be found on Halla-san, where climates range from the subtropical to the temperate and, even in some areas, polar.
The Geomunoreum Lava Tube system was instrumental to Jeju's selection as a World Heritage site. The Geomunoreum caves were formed by lava pouring down the island's coastline from Halla-san, and both its length and scale make it one of the largest and most distinctive of any such cave systems in the world.
Seongsan Ilchulbong peak is an ideal spot for enjoying the sunrise. As it rose from the sea, the geological history of the formation attracts visitors.
In addition to the designation as Natural World Heritage Site in 2007, Jeju Island has also been appointed to the World Network of Biosphere Reserve in 2002 and the Global Geoparks Network in 2010. Jeju Island is the first spot in the world to receive the UNESCO Triple crown designation. Highlighting these aspects, Korea put a huge effort in the vote for the New 7 Wonders. The island is an unexplored district containing all seven themes; great landscape, island, volcanoes, coast, cave, falls, and forest which were the main required elements for the vote. Unlike other proposed sites, Jeju Island maintains a close connection with the lives of people, offering space for culture and history to co-exist.