Yongch'ŏn Cave (Korea)

found: Work cat.: 2016469547: Yongch'ŏn tonggul ŭi sinbi, 2011:title page (Yongch'ŏn Tonggul; Yongcheondonggul) preface, etc, (locate in Jeju Special Self-governing Province; discovered in May, 2005; designated as a UNESCO Natural World Heritage Site in 2007; Yongcheon Cave)

found: Korea Tourism Organization www site, viewed June 02, 2017(Yongch'ŏn Tonggul; Yongcheon Cave; the most typical form of lava tunnel on Jeju Island; unique topology and rich limestone formations such as lava terrace, lava shelves, lava waterfalls, lava rolls; also items that can be found throughout the cave that appear to have been brought in by people who lived on the island long ago, such as pieces of pottery, animal bones, ironware, charcoal and other substances)