; and (bb) if the portion qualifies for certification as a component of the applicable trail, consistent with section 3(a)(3). (II) Certification agreement (aa) In general The approval by an owner of applicable non-Federal land of a certification agreement shall satisfy the consent requirements of subclause (I)(aa). (bb) Termination A certification agreement referred to in item (aa) may be terminated at any time. (iii) Access to private property The establishment of a trail by subparagraph (A) does not authorize any person to enter private property without the consent of the owner of the private property. (iv) Recognition of alternative names for trails In referring to a trail established by subparagraph (A) in maps and other documents, the Secretary of the Interior may acknowledge and use any alternative name that was historically used to reference the trail, including the Great Western Trail . (D) Land acquisition (i) Donation The Secretary of the Interior may accept a donation of land or an interest in land for a trail established by subparagraph (A). (ii) Limitation The Secretary of the Interior may not acquire for a trail established by subparagraph (A) any land or interest in land— (I) that is located outside the exterior boundary of any federally managed area without the consent of the owner of the land or interest in land