Section 1
SECTION 1. The boundary between the Province of Benguet on the south and the subprovinces of Lepanto and Amburayan on the north shall be a line beginning at the point where the watershed dividing the waters of the Amburayan River and its tributaries on the north from those of several smaller streams on the south flowing in a generally southwesterly direction through the Province of Benguet intersects the present eastern boundary of the Province of La Union, and extending in a generally northeasterly direction medially along the crest of the above-described watershed and of the watershed which divides the waters of the Abra River and its tributaries from the waters of the Agno River and its tributaries to the point where the ridge forming the latter watershed leaves the face of the high mountain known as Mount Data, and thence in a straight line along the side of Mount Data to the point where the ridge or watershed between the Agno River and the streams of Nueva Vizcaya joins Mount Data.