SECTION 1. Section seven hundred and one of Republic Act Numbered Nineteen hundred and thirty-seven, otherwise known as the Tariff and Customs Code of the Philippines, as amended by Republic Act Numbered Thirty-seven hundred and fifty-seven, is further amended to read as follows:
"SEC. 701. Collection Districts and Ports of Entry thereof.—For administrative purposes, the Philippines shall be divided into as many collection districts as there are at present existing, the respective limits of which may be changed from time to time by the Commissioner, upon the approval of the department head. The principal ports of entry for the respective collection districts shall be Manila, Sual, Tabaco, Cebu, Pulupandan, Sia-in, Iloilo, Davao, Legazpi, Zamboanga, Jolo, Aparri, Jose Panga-niban, Cagayan, Tacloban, San Fernando, Hinigaran, Dumaguete City, Iligan City, Maasin, Masao, Virac, Batalay, Supang and Batangas."