The atoll is comprised of four large coral islands which enclose a shallow lagoon; the group of islands is itself surrounded by a coral reef.

• 阿尔达布拉环礁由4个大的珊瑚岛组成，岛群内怀抱一浅浅的礁湖，同时岛群本身又被一珊瑚礁所包围。