三墩

三墩

　　(瀛岛联璧)三墩，在徐城镇南10公里处的海面上，系三个小海岛，分别称为头墩、二墩、三墩，总称“三墩”。附近还有一小沙墩，名娄时墩。头墩靠海岸最近，退潮时可行上墩，二墩次之，三墩较远，必乘舟渡水方可达。墩上有古庙古井遗迹，清时人美其名“龙泉淡井”。三墩连环，立于海峡之中，景致非凡，雅称“瀛岛联璧”。

　　二敦岛的南滩一带，出露大片的玄武岩巨石，这些巨石皆为炽热的岩浆喷出或溢流出地表，遭遇海水突然冷却而成。强烈的温度梯度，使巨石表面发生差异收缩，形成龟背纹状，惟妙惟肖，实堪称一大奇观。

　　现在粤海铁路的通道栈桥在这里修建，西防波堤贯穿头墩和二墩，使得墩岛与陆地相连，游人可以乘车前往。在二墩岛上有一座40米高的现代导航灯塔，可供游人登高远眺，观潮听涛。

　　

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