as generally depicted on map 8, to remain in effect for the 10-year period beginning on the date of enactment of this Act. (B) The Naukati commercial thinning study plot on the parcel of Federal land described in section 3(2)(B), as generally depicted on map 8, to remain in effect for the 15-year period beginning on the date of enactment of this Act. (C) The POW Yatuk study plot on the parcel of Federal land described in section 3(2)(A), as generally depicted on map 8, to remain in effect for the 10-year period beginning on the date of enactment of this Act. (D) The POW Naukati study plot on the parcel of Federal land described in section 3(2)(D), as generally depicted on map 8, to remain in effect for the 10-year period beginning on the date of enactment of this Act. (E) The Revilla George study plot on the parcel of Federal land described in section 3(2)(G), as generally depicted on map 8, to remain in effect for the 10-year period beginning on the date of enactment of this Act. (2) Prohibited activities The Alaska Mental Health Trust shall not construct any new road or harvest timber on any study plot covered by a research easement described in paragraph (1) during the period described in subparagraph (A), (B), (C), (D), or (E) of that paragraph, as applicable. (g) Area of karst concern (1) In general In conveying the parcels of Federal land described in subparagraphs (A) and (D) of section 3(2) to the Alaska Mental Health Trust under subsection (a), the Secretary shall reserve to the United States a conservation easement that shall protect the aquatic and riparian habitat within the area labeled Conservation Easement , as generally depicted on map 8. (2) Prohibited activities The conservation easement described in paragraph (1) shall prohibit within the area covered by the conservation easement— (A) new road construction and timber harvest within 100 feet of any anadromous water bodies (including underground water bodies)