an Entity references as follows:
Isen (伊仙町, Isen-chō) is a town located on Tokunoshima, in Ōshima District, Kagoshima Prefecture, Japan. As of June 2013, the town has an estimated population of 6,594 and a population density of 105 persons per km². The total area is 62.70 km². Isen is known for its abundant nature, long-lived residents, and Tōgyū (bullfighting).