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Median line

A theoretical "median line", also known as the Davis line, was defined down the middle of the strait by US Air Force General Benjamin O. Davis Jr. in 1955, after which the US pressured both sides not to cross it. As a tacit understanding, it never gained official or legal status. The PRC avoided the line when its air and naval powers were still weak but has never recognized the median line. Aircraft from Taiwan crossed it frequently until the Second Taiwan Strait Crisis in 1958. After its first encroachment in 1999, China has sent aircraft over the median line with increasing regularity, although it tries not to do so when relations with Taiwan are good.

In 2019, Taiwan's defense ministry provided coordinates for the median line. The ministry recognizes the line as running from 27°N, 122°E in the north to 23°N, 118°E on the southern end.