12. “Tenured migrant communities” are communities within protected areas which have actually and continuously occupied such areas for ve (5) years before the designation of the same as protected areas in accordance with this Act and are solely dependent therein for subsistence; and 13. “Wildlife sanctuary” comprises an area which assures the natural conditions necessary to protect nationally signi cant species, groups of species, biotic communities or physical features of the environment where these may require speci c human manipulations for their perpetuation. SECTION 5.          Establishment and Extent of the System – The establishment and operationalization of the System shall involve the following: 1. All areas or islands in the Philippines proclaimed, designated or set aside, pursuant to a law, presidential decree, presidential proclamation or executive order as national park, game refuge, bird and wildlife sanctuary, wilderness area, strict nature reserve, watershed, mangrove reserve, sh sanctuary, natural and historical landmark, protected and managed landscape/seascape as well as identi ed virgin forests before the effectivity of this Act are hereby designated as initial components of the System. The initial components of the System shall be governed by existing laws, rules and regulations, not inconsistent with this Act; 2. Within one (1) year from the effectivity of this Act, the DENR shall submit to the Senate and the House of Representatives a map and legal descriptions or natural boundaries of each protected area initially comprising the System. Such maps and legal description shall, by virtue of this Act, constitute the o cial documentary representation of the entire System, subject to such changes as Congress deems necessary; 3. All DENR records pertaining to said protected areas, including maps and legal descriptions or natural boundaries, copies of rules and regulations governing them, copies of public notices of, and reports submitted to Congress regarding pending additions, eliminations, or modi cations shall be made available to the public. These legal documents pertaining to protected areas shall also be available to the public in the respective DENR Regional O ces, Provincial Environment and Natural Resources O ces (PENROs) and Community Environment and Natural Resources O ces (CENROs) where NIPAS areas are located; 4. Within three (3) years from the effectivity of this Act, the DENR shall study and review each area tentatively composing the System as to its suitability or non-suitability for preservation as protected area and inclusion in the System according to the categories established in Section 3 hereof and report its ndings to the President as soon as each study is completed. The study must include in each area: 1.         A forest occupants survey; /