The convenient communications make it an important water passage connecting Shanghai with Jian Zhe provinces.

市级河道淀浦河、油墩港纵贯全境,水、陆交通便捷,是沟通上海与江浙两省的重要水上通道.

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On top of the wall, there is a brick water passage trough every 40 city wallXi'an.

城墙顶部每隔40至60米有一道用青砖砌成的水槽,用于排水,对西安古城墙的长期保护起了非常重要的作用.

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