Does Sanshui District of Foshan belong to Chaoshan District?

Don't belong. Chaoshan is a region of Guangdong Province, China, which is located in the east of Guangdong Province, near the border of Fujian Province, and consists of Chaozhou City and Shantou City. Foshan is a prefecture-level city in Guangdong Province, which belongs to the jurisdiction of Guangdong Province. Sanshui District of Foshan is located in the middle of Guangdong Province, both of which belong to Guangdong Province, but they are different regions.