Local Government Code of 1991
Section 6. Authority to Create Local Government Units. - A local government unit may be created, divided, merged, abolished, or its boundaries substantially altered either by law enacted by Congress in the case of a province, city, municipality, or any other political subdivision, or by ordinance passed by the sangguniang panlalawigan or sangguniang panlungsod concerned in the case of a barangay located within its territorial jurisdiction, subject to such limitations and requirements prescribed in this Code.