The Stone City is the popular name of an ancient fortified city within the current city of Nanjing. Almost all of the original city is gone; all that remains are portions of the massive city wall.
The original town was built during the Warring States Period by the kingdom of Chu. The city was expanded during the Later Han Dynasty and a wall, about nine thousand meters in circumference, was built around the existing Chu-era city. Today the Stone City lies within the confines of Nanjing's Qingliang Park. The ancient city is strongly enough associated with Nanjing that Nanjing itself is sometimes referred to as "Stone City".