Law on the Territorial Sea and the Contiguous Zone of the Republic of China Article 6

In the event that the territorial sea of the Republic of China overlaps with the territorial sea of adjacent or opposite states, the delimitation shall be the equidistant median line. Where there is an agreement, such agreement shall prevail.The equidistant median line prescribed in the preceding paragraph is a line on which every point is equidistant from the nearest points on the baseline of the Republic of China and the adjacent or opposite states.
中文原文 中華民國領海及鄰接區法第6條
中華民國領海與相鄰或相向國家間之領海重疊時,以等距中線為其分界線。
但有協議者,從其協議。
前項等距中線,係指該線上各點至中華民國基線上最近點與相鄰或相向國家基線上最近點距離相等之線。

English translation for reference only; the Chinese text prevails. Not legal advice.