image source: Republic of Korea / Flickr
Jeju is a volcanic island, dominated by Hallasan: a volcano 1,950 metres (6,400 ft) high and the highest mountain in South Korea. The landscape has many craters scattered everywhere. In 2011, Jeju was voted one of the New 7 Wonders of Nature.
image source: Republic of Korea / Flickr
Jeju is scientifically valuable for its extensive system of lava tubes (also known as lateral volcanoes or in Korean as Oreum). These natural conduits through which magma once flowed are now empty caves that are some of the largest in the world.
image source: Republic of Korea / Flickr
Abu Oreum, with its ring of trees – image source: Republic of Korea / Flickr
image source: Republic of Korea / Flickr
image source: Republic of Korea / Flickr
image source: Republic of Korea / Flickr
Hallasan, the main volcano, at the heart of the island – image source: Republic of Korea / Flickr
By Khitai (a flickr user) – https://www.flickr.com/photos/ysjjhfox/247930190/, CC BY-SA 2.0, Link
image source: Republic of Korea / Flickr
e MORFES 
Thanks for introducing this beautiful volcanic island to us. ❤
Reblogged this on Alessandria today.
Very interesting – another place I had never heard about.
Wow, what an incredible place!
Immagini straordinariamente belle, di terrehe bisognerebbe visitare per il loro immenso fascino
Un caro saluto,silvia