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据有关历史资料证明，微山湖底确有一座古城，称之留城，其位置在今微山湖微山岛的西南方向。由于微山湖的逐步形成，古留城被淹没在水下湖底，早在明代万历年间，已陷沉于水中。秦代秦始皇兴兵灭楚、齐、燕、韩、赵、魏，统一了六国后，为加强中央集权，推行郡县制，设置留县
According to the historical data to prove that Weishan Lake does have an ancient city, called the retention city, its location in Weishan Lake Weishan Island in the southwest. Due to the gradual formation of Weishan Lake, the ancient city was submerged in the bottom of the lake. As early as the Ming Dynasty Wanli years, it had sunk in the water. In the Qin Dynasty, the First Emperor of the Qin Dynasty eliminated the forces of Chu, Qi, Yan, Han, Zhao and Wei. After the reunification of the six countries, in order to strengthen the centralization of power and promote the system of counties and counties,