In the Mirage continuity, Chihaya (襅) is the name of the village in Japan where Hamato Splinter was born. In TMNT volume 2, issue #1: Memories of the Future,, Donatello dreams of burying Splinter in this village.
It is unknown what real-world village, if any, Chihaya is meant to represent. The closest equivalent seems to be Chihayaakasaka, which is located on the island of Honshū as Mount Fuji is, but is in the Ōsaka prefecture and not close enough to Fuji (located in Shizuoka and Yamanashi) to be as visible as it is in the comic, if at all.