The area around surrounding the Kitakami River estuary of Ishinomaki-shi (Miyagi Prefecture) has mountains, rivers and ocean based on a rich ecosystem which suffered tsunami damage in the Great East Japan Earthquake. The ecosystem has been maintained through the moderate harvesting of resources in accordance with rules set by the local residents. However, due to the earthquake and tsunami, residents were forced to relocate to high ground and the community became reorganized. This research will explore how people can reconstruct natural resource management mechanisms after relocation. Surveys detailing the current situation and past data were also examined to create understanding on how to revitalize the area. This issue is universally applicable due to the number of group relocations caused by natural disasters, so based on these findings, policy recommendations will be made. [No. R16-1002]