Land Act Article 42

The general registration of land may be carried out by districts to be known as “registration districts”.The registration districts referred to in the preceding paragraph shall not be smaller than an urban district in the case of the Special Municipality, or a Township (City), District in the case of County (City).
中文原文 土地法第42條
土地總登記得分若干登記區辦理。
前項登記區,在直轄市不得小於區,在縣(市)不得小於鄉(鎮、市、區)。

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