古洞地处香港新界北区上水，位於上水西部，落马洲之东南，是双鱼河流经的一处地方，为围头人（包括同操粤语莞宝片之东莞人）、客家人与少数潮州人之聚居地。
被誉为“云南第一洞”的阿庐古洞，又名泸源洞，距昆明200公里，位于泸西县叹2。
Ancient Alu Caves (also known as Luyuan Caves) is the most famous caves of Yunnan. It located about 200 km from Kunming, and 2.5 kilometers from Luxi County.
在半岛北部，海拔足够低，因此古玛雅人能够经由被称为竖井的深层排水口或深洞探及地下水位。
In the northern peninsula the elevation is sufficiently low that the ancient Maya were able to reach the water table at deep sinkholes called cenotes, or at deep caves.
在古英语里，它叫eyethurl, thurl是hole(洞)的古老的写法，整个词的意思是窥视孔。
In old English these were called eyethurls and since thurl is an old word for hole, this means eye holes.
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