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Natural landscape based on scenic and biotic resources is regarded as the primary value in National Parks in Japan. Preservation of unique, nationally significant landscape is of great significance for the parks. Steadily growing demand on limited park areas and changes of use types or levels in the parks affect value and quality of the landscape significantly. Assessing features of significant landscapes and monitoring such changes of these landscapes are critical to conserve the landscape. Fundamentals to an accurate and reliable assessment are describing changes and inventorying the resources. Of particular importance would be to grasp the change of significant scenes. A scheme for conserving the landscape is discussed by mapping and inventorying changes of scenic resources in this paper. Changes of scenic resources were based on the photographs inserted in official printings for visitors. This case study was conducted in Akan National Park, Hokkaido, Japan. Scene and observers' position showed in a photographs were mapped to make a systematic inventory of visual resources and impacts from use and developments. Mapped data showed the critical view-points, view sheds, alternation of distribution of representative scenic resources in about 60 years. Scene that commonly represented in both ages have symbolic elements of this park. The view shed of the scene was characterized by an upward view to mountains from lakeside, a downward view to lake from ridge and mountain. Scene in the photographs conveyed the following scenic structure; natural line of edge, clear focal point, depth made by gradation of texture and compositional constructs. I consider that the change of frequency to encounter the vista, alternation of opinions to natural environments, appearance of new vision of natural landscape caused change of selected scenes of the park. These distributions of objects did not partially coincide with the management zone, which was designated by Environmental Agency, regarded as the highest grades of scenic beauty and the minimum degree of human impact to the natural environment.