Gasi Oreum () is an oreum (small extinct volcano) in , Seogwipo, Jeju Province, South Korea. It has an elevation of 106.5m, height of 77m, circumference of 1,874m, and area of 263,863m2.
The mountain goes by a variety of names, including Gasireum (), Gasiak (), and Ipak (). The term gasi in the hill's name, means thorn, and refers to the numerous thorny plants that grow on the hill.
The hill has a hiking trail on it. It has been described by several writers as a fairly easy hike, in part owing to the hill's small height and size.
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