Daying County () 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 . Daying is remarkable for being the home of the "Chinese Dead Sea", a tourist attraction that is based on a salt lake with 9 times the salinity of the ocean and which constitutes the largest indoor water park in China