Kesen(気仙郡,Kesen-gun?) is a district in Iwate Prefecture, Japan and consists of the town of Sumita. Sumita is small community which borders the neighbouring cities of Ōfunato and Rikuzentakata and Ōshū. Nearly 90 percent of Sumita is forested. The economic base is largely agricultural and forestry-related. Its population was listed at 5,952 residents as of January, 2014.