Is going from Fuzhou to Matsu considered leaving the country?

Forget it. Fuzhou, referred to as "Rong", also known as Rongcheng, and historically known as the capital of Fujian, is a prefecture-level city under the jurisdiction of Fujian Province, the provincial capital, the core city of the Fuzhou metropolitan area, and a riverside and seaside ecological garden city. According to Mafengwo, going from Fuzhou to Matsu is considered as leaving the country, and you must leave the country due to the need for a visa. The Matsu Islands are located in the eastern waters of Lianjiang County, Fuzhou City, Fujian Province, and are administratively divided into Lianjiang County, Fujian Province.