"Beginning at Cabuban Bridge, on the Cotabato-Dalican-Allah Road, going due west to a point on the boundary line of the municipalities of Dinaig and Upi; thence going on a southwesterly direction following the boundary line of Dinaig and Upi to a point following the boundary lines of the municipalities of Lebak, Upi, Datu Piang and Dinaig meet; thence going on a southeasterly direction following the boundary line of the municipalities of Lebak and Datu Piang to a point where the boundary lines of the municipalities of Lebak, Datu Piang and Isulan meet; thence going due east following the boundary line of the municipalities of Datu Piang and Isulan to Allah Bridge, on the Cotabato-Dalican-Allah Road; thence going on a northeasterly direction following the course of the Allah River downstream to the junction of the Allah and Kapingkong Rivers, thence going on a northwesterly direction following the Allah River downstream to the junction of the Allah and Cabulnan Rivers; thence going on a southwesterly direction following the course of the Cotabato-Dalican-Allah Road, the point of beginning."