Section 118Local Government Code of 1991 (Republic Act No. 7160), Sec. 118

Jurisdictional Responsibility for Settlement of Boundary Dispute. - Boundary disputes between and among local government units shall, as much as possible, be settled amicably. To this end:

(a) Boundary disputes involving two (2) or more barangays in the same city or municipality shall be referred for settlement to the sangguniang panlungsod or sangguniang bayan concerned.

(b) Boundary disputes involving two (2) or more municipalities within the same province shall be referred for settlement to the sangguniang panlalawigan concerned.

(c) Boundary disputes involving municipalities or component cities of different provinces shall be jointly referred for settlement to the sanggunians of the province concerned.

(d) Boundary disputes involving a component city or municipality on the one hand and a highly urbanized city on the other, or two (2) or more highly urbanized cities, shall be jointly referred for settlement to the respective sanggunians of the parties.

(e) In the event the sanggunian fails to effect an amicable settlement within sixty (60) days from the date the dispute was referred thereto, it shall issue a certification to that effect. Thereafter, the dispute shall be formally tried by the sanggunian concerned which shall decide the issue within sixty (60) days from the date of the certification referred to above.