The Banking Act of The Republic of China Article 26

The central competent authority may restrict the establishment of banks or their branches in specific regions depending on the domestic financial and economic conditions.
中文原文 銀行法第26條
中央主管機關得視國內經濟、金融情形,於一定區域內限制銀行或其分支機構之增設。

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