What is the nature of Taiwan Province Strait? Is it the inland sea?

Not counting the inland sea, the width is more than 24 nautical miles.

A strait connecting the South China Sea and the East China Sea of China, between Fujian and Taiwan Province provinces in China. It starts from Fuguijiao, New Taipei City, Taiwan Province Province, China, to Pingtan Island, Fujian Province, and to Dongshan Island, Taiwan Province Province, China Province.

The west coast of the Strait is the south-central coast of Fujian. From the western end of the northern mouth of the Strait (south of Changle County) to the coastal junction of Fujian and Guangdong, the mainland coastline is about 1.900 km long, with twists and turns. Coastal land is a hilly branch extending from the eastern mountainous area of Fujian to the southeast, close to the coast, forming many peninsulas, bays, rocky shores and offshore islands.

Extended data:

Because Taiwan Province Province and its Strait lie between Asia and the Pacific Ocean, it was regarded as a window to monitor the activities along the southeast coast of China or a stronghold for China to break the first island chain and enter the Pacific Ocean after World War II.

The traffic status of Taiwan Province Strait in the East China Sea became one of the areas where Li Dan, Zheng Zhilong, Lin Daogan and other maritime armed groups were active in the Ming and Qing Dynasties, and the Taiwan Province Strait became the inner lake of Zheng Zhilong and his successor Zheng Fleet.

Zheng Zhilong took South China, Taiwan Province Province and Japan as the activity stage, and operated Hirado Island, Nagasaki and Manila in Japan, forming the main commercial navigation channels in South China and Southeast Asia. The Taiwan Province Strait is also the main sea area for the activities and battles of maritime armed groups.

Baidu Encyclopedia-Taiwan Province Strait