Shenzhen

Shenzhen is a prefecture-level city in the province of Guangdong, China. A special economic zone, it is located on the east bank of the Pearl River estuary on the central coast of Guangdong, bordering Hong Kong to the south, Dongguan to the north, Huizhou to the northeast, and Macau to the southwest. With a population of 17.5 million in 2020, Shenzhen is the third-most-populous city by urban population in China after Shanghai and Beijing. The Port of Shenzhen is the world's fourth-busiest container port.Wikipedia

Guangdong is a coastal province in South China, on the north shore of the South China Sea with Guangzhou as the capital. With a population of 127.06 million across a total area of about 179,800 km2 (69,400 sq mi), Guangdong is China's most populous province and its 15th-largest by area, as well as the third-most populous country subdivision in the world.Wikipedia