First place in the world to obtain UNESCO designations in all 3 natural sciences

Jeju Island is an oval-shaped volcanic island with 1,950 meter Halla Mountain in the middle. The island is 73 km from west to east and 31 km from north to south. 
Jeju which was created by volcanic activity is known for its unique volcanic features, and the entire island itself is like a volcanic museum. There are 368 oreum on the island (※ oreum: It means ‘small mountain’ in Jeju dialect) and over 160 lava tubes are scattered on the island. It’s very rare to see a small island that has both oreum and caves in the world.
The value of Jeju was proved as the island received as the island was designated Biosphere Reserve in 2002, World Natural Heritage in 2007 and Global Geopark in 2010, making the sub-tropical island only place on Earth to receive all three UNESCO designations in natural sciences.
Jeju has now become a ‘treasure island of environmental assets’ that the world has to preserve.