后湖黄册库是明代洪武年间,为了贮藏全国各地的户籍赋税档案,在南京后湖专门修建的库房。后湖就是现在南京的玄武湖。玄武湖古名桑泊,自三国吴引水入城起直至南朝刘宋,先后称作后湖、练湖、蒋陵湖、北湖。宋孝武帝时,两次在玄武湖检阅水军,称湖为昆明湖。南朝宋文帝刘义隆时,因见湖中出现黑龙(锷鱼),改名玄武湖。后湖的面积很大,周围约有四十里。湖中有五个小岛,分别叫 After the Yellow Lake Library is the Ming Dynasty Hongwu years, in order to store all parts of the country’s household tax files, specially built in Nanjing Lake warehouse. Lake is now the Xuanwu Lake in Nanjing. The ancient name of Xuanwu Lake Sang Po, Wu diversion from the Three Kingdoms into the city until the Southern Song Dynasty, has called after the lake, practicing the lake, Jiangling Lake, North Lake. Emperor Song Xiaowu, twice in Xuanwu Lake review of the navy, said the lake Kunming Lake. When the Southern Song Dynasty Emperor Liu Yilong, due to see the lake appeared Black Dragon (catfish), renamed Xuanwu Lake. After the lake area is very large, about forty miles around. There are five islands in the lake, called respectively