东部岛礁区为西沙隆起的较高部位，海水较浅，基底之上直接覆盖礁相沉积地层。
The eastern reef island area, with shallow seawater, is higher parts of Xisha apophysis, where the basement is directly covered with reef facies carbonate rocks.
东部岛礁区为西沙隆起的较高部位，海水较浅，基底之上直接覆盖礁相沉积地层。
The eastern reef island area, with shallow seawater, is higher parts of Xisha apophysis, where the basement is directly covered with reef facies carbonate rocks.
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