A heritage area which has been acquired by the Department of Natural Resources for the Heritage Trust Program may become dedicated as a heritage preserve after written recommendation of the board and approval by the Governor. Any other real property owned by the State of Georgia and under the custody of the department may be similarly dedicated. The written recommendation shall contain a provision which designates the best and most important use or uses to which the land is to be put. The dedication as a heritage preserve shall become effective when the written recommendation and the approval of the Governor are filed with the office of the Secretary of State. The written recommendation and the approval of the Governor shall be filed in the office of the clerk of the superior court of the county or counties in which the heritage preserve is located.