護城河






西安的护城河




北京紫禁城的護城河


護城河，亦作城壕或城濠，是古時由人工挖鑿，環繞整座城、宫城、寺院等主要建築的河，具有防禦作用，可防止敵人或動物入侵。


世界各國在古代已有開鑿護城河。在中國大陆北京的紫禁城、臺灣新竹古城、左營舊城、億載金城、日本的古城如松本城、江戶（今東京）的皇居、以至歐洲各國的城堡及皇宮等等地方都建有護城河。歐洲不少城堡在護城河上建有可升起的木橋，以方便出入，亦可防止敵人進入。



护城河治理


中国大陆不少城市都拥有护城河。对护城河进行治理，通常需要地方政府花费大量金钱及时间。[1][2]



注释





  1. ^ 西安“生物战”治理护城河. 网易 来源: 西安晚报(西安). 2010-07-22 [2011-05-31] （简体中文）. 


  2. ^ 楚天都市报记者刘汉泽，实习生方灿. 荆州部分污水处理厂未上岗 护城河治理未见成效. 荆楚网 来源：楚天都市报. 2011-05-28 （简体中文）.  缺少或|url=为空 (帮助); 使用|accessdate=需要含有|url= (帮助)









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