The island has a mountainous, nearly impenetrable interior, white-sand beaches, and famous blue lagoon defined by an offshore coral reef.
岛上有连绵不断地山体，白色沙滩和由离岸珊瑚礁确立的著名蓝色泻湖。
Barrier reef: a long, narrow ridge of coral or rock parallel to and relatively near a coastline, separated from the coastline by a lagoon too deep for coral growth.
堡礁：一狭长的与海岸平行且相对靠近海岸的珊瑚礁或岩石，常被很深的、不适合珊瑚生长的环礁湖与海岸隔开。
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