古代筑城,就要挖濠河。不过,南通濠河的来历可不同一般。古代,长江东来,到此已是汪洋一片。年长日久,长江上游的泥沙在这里沉淀,渐渐长出沙洲。南北朝时已经有了胡逗洲。一千多年前,胡逗洲又渐渐与大陆长连,成为新陆地。然而,大海东退,却留下了大大小小的水泊。大水泊似湖,小水泊如塘。水泊中又往往留下零星沙汀。后周显德五年(958)筑城,称通州。明代万历年间,又在城南辟新城。新旧两城,一小一大,前后相接,状似葫芦。两次筑城都利用了天然水泊,裁弯就直,挖沟串连,濠河就成了链珠似的南北两环,而且“特深广,望之汪洋,足称巨观”(《光绪通州 Ancient fortification, we must dig Hao River. However, the history of Nantong Hao River can be different. Ancient times, the east of the Yangtze River, this is a vast ocean. As time goes by, the sediment in the upper reaches of the Yangtze River settles here and grows into a sandbar. Southern and Northern Dynasties already had Hu Qiaozhou. A thousand years ago, Hu Chau continent gradually with the mainland, becoming a new land. However, the sea retreated, leaving large and small water parks. Large water park like a lake, a small water ponds such as ponds. Water park often leave scattered Sha Ting. After weeks Xiande five years (958) built the city, said Tongzhou. Ming Dynasty Wanli years, but also in the south of New City. Old and new city, a small one, before and after phase, shaped like gourd. Two fortifications all use natural waterways, cutting straight, digging ditches in tandem, and Haohe has become a pearl-like north-south ring, and “extraordinarily wide, hopefulness, and grand scale” Guangxu Tongzhou