Terraced rice field in the mountainous area, called
Tanada, is recently evaluated as Cultural Landscape. This study analyzed formation of
Tanada landscape by solving mechanism of its irrigation system. Diversified landscapes of
Tanada could be seen at several settlements in Niikawa Tagomori. The irrigation filling each patch with water has been formed adapting to its landform. Therefore, two rice fields were examined and founded that completely different systems existed on each site. This demonstrates that peculiar landscape was formed based on its original irrigation system, and the diversity of the systems has leaded different condition of cultivation continuity.
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