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|Country||People's Republic of China|
|County seat||Penglai (蓬莱镇)|
|• Total||703 km2 (271 sq mi)|
|Elevation||305 m (1,001 ft)|
|• Density||740/km2 (1,900/sq mi)|
|Time zone||UTC+8 (China Standard)|
Daying County (simplified Chinese: 大英县; traditional Chinese: 大英縣; pinyin: Dàyīng Xiàn) is a county of Sichuan province, China, under the administration of Suining City and in the central part of the Sichuan Basin. In 2002, it had a population of 520,000 residing in an area of 703 km2 (271 sq mi).
Daying is the home of the "Chinese Dead Sea", a tourist attraction that is based on a salt lake with nine times the salinity of the ocean and which constitutes the largest indoor water park in China.