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23.652455°N 119.520128°E 小門嶼係澎湖群島之一,屬於澎湖縣西嶼鄉小門村,因為佢喺吼門水道旁,所以有吼門之珠之稱[1],佢喺西嶼北方,以闊約20 m嘅水道同西嶼相隔,面積約0.5平方公里(50公頃),最高處喺島嶼西北側,高23 m。[2]
小門嶼整體係一座玄武岩方山小島[3],南、北兩岸柱狀節理玄武岩較為發達。東岸多孔狀玄武岩發達,球狀風化好普遍。東北部臺地受雨水侵蝕後造成好多小雨溝,類似惡地地形。[2]
小門嶼嘅指標地層係小門嶼層,佢由近代隆起嘅海濱沈積物所組成,可分為上層嘅殼灰岩同下層嘅鐵質石英砂岩同疏鬆嘅砂岩、泥岩互層。[3]
有條小門橋橫跨分隔小門嶼同西嶼嘅水道,佢係小門嶼唯一嘅對外橋梁,而小門橋又叫跨海小橋。[1]對外道路編號係澎2鄉道。[4]
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