Mulyeongari-oreum is a lake and wetland located on Jeju island. It is the only wetland in Korea which is located within a volcanic crater in a parasitic cone, called an oreum in the Jeju dialect of Korean. The oreum is one of the secondary volcanoes around the Hallasan volcano, which is the highest mountain in South Korea. Through continuing scientific research, it is thought that Mulyeongari-oreum was formed by volcanic activity continuing for 2,500 years at the end of the third Cenozoic Era on Jeju Island. On top of the oreum, there is a shallow crater lake which displays a unique example of a wetland. The level of water changes with the seasons due to rainfall and the particular geology. Some 370 parasitic cones are located around Hallasan. Only about 30% of them have mountain craters.
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| - Mulyeongari-oreum is a lake and wetland located on Jeju island. It is the only wetland in Korea which is located within a volcanic crater in a parasitic cone, called an oreum in the Jeju dialect of Korean. The oreum is one of the secondary volcanoes around the Hallasan volcano, which is the highest mountain in South Korea. Through continuing scientific research, it is thought that Mulyeongari-oreum was formed by volcanic activity continuing for 2,500 years at the end of the third Cenozoic Era on Jeju Island. On top of the oreum, there is a shallow crater lake which displays a unique example of a wetland. The level of water changes with the seasons due to rainfall and the particular geology. Some 370 parasitic cones are located around Hallasan. Only about 30% of them have mountain craters. (en)
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| - Mulyeongari-oreum is a lake and wetland located on Jeju island. It is the only wetland in Korea which is located within a volcanic crater in a parasitic cone, called an oreum in the Jeju dialect of Korean. The oreum is one of the secondary volcanoes around the Hallasan volcano, which is the highest mountain in South Korea. Through continuing scientific research, it is thought that Mulyeongari-oreum was formed by volcanic activity continuing for 2,500 years at the end of the third Cenozoic Era on Jeju Island. On top of the oreum, there is a shallow crater lake which displays a unique example of a wetland. The level of water changes with the seasons due to rainfall and the particular geology. Some 370 parasitic cones are located around Hallasan. Only about 30% of them have mountain craters. The geology is mostly composed of water-permeable basalt, so it is unusual to have a lake on top of such volcanic cones. During the dry season, most of wetland becomes dries out, except the deepest part in the south (about 50m of water depth). During the rainy season, most of it is submerged. (en)
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