Lianshui County (simplified Chinese: 涟水县; traditional Chinese: 漣水縣; pinyin: Liánshuǐ Xiàn) is under the administration of Huai'an, Jiangsu province, China.

The northernmost county-level division of Huai'an, it borders the prefecture-level cities of Lianyungang to the north, Yancheng to the east, and Suqian to the west.

At present, Lianshui County has 17 towns and 2 townships.

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