Local Government Act Article 21
Self-government matters of special municipalities, counties/cities, or townships/cities that involve other special municipalities, counties/cities, or townships/cities shall be carried out through joint collaboration between the respective local self-governing bodies. When necessary, a common, higher-level competent authority for such matters shall coordinate the collaboration of the aforementioned bodies or shall appoint one of the bodies to carry out the matter within a specified period of time.
中文原文 地方制度法第21條
地方自治事項涉及跨直轄市、縣（市）、鄉（鎮、市）區域時，由各該地方自治團體協商辦理；必要時，由共同上級業務主管機關協調各相關地方自治團體共同辦理或指定其中一地方自治團體限期辦理。