Presidential Decree No. 1580 — NOW, THEREFORE, I, FERDINAND E. MARCOS, President of the Philippines, by virtue of the powers vested in me by the Constitution, do hereby order and decree the amendment of Section 1 of Presidential Decree No. 1011 dated September 22, 1976, as follows:

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Section 1 · Section 1 of Presidential Decree No Section 2 · This Decree shall take effect immediately

Section 1

Section 1 of Presidential Decree No

Section 1. Section 1 of Presidential Decree No. 1011 is hereby amended to read as follows:

"Section 1. Barangays Looy, Bongo, Biarong, Lamud, Kigan, Pandan, Romoangaob, Basak (Upi side), Pilar, San Jose and Itaw, all in the Municipality of Upi, Province of Maguindanao, are hereby detached and separated therefrom to form and constitute a distinct and independent municipality which is created to be known as the Municipality of South Upi without affecting in any manner the legal existence of the mother municipality of Upi. The seat of government of the newly created municipality shall be in Sitio Timanan in Barangay Romoangaob."

Section 2

This Decree shall take effect immediately

Section 2. This Decree shall take effect immediately.

Done in the City of Manila, this 11th day of June, in the year of Our Lord, nineteen hundred and seventy-eight.