I guess I saw that video.
카르스트 지형의 정수 means "The essence of Karst topography" or
"The Quintessential place of Karst topography"
"카르스트 지형의 정수인 방비엥의 높고 푸른 산" means
"The high and green mountain of Vang Vieng which place is the quintessential Karst topography"
18 ตุลาคม 2014
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In the video I'm watching :) This is the caption "카르스트 지형의 정수인 방비엥의 높고 푸른 산"
18 ตุลาคม 2014
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Where did you find that phrase?
What is the whole sentence?