Raiden Onsen

Raiden Onsen—Thunder and Lightning Spring—in Iwanai Town, Hokkaido, takes its name from the thunder deity whose name may derive from Ainu linguistic heritage (theories suggest the name comes from Ainu words meaning dried wood, low promontory, or related to a Yoshitsune and Benkei legend about the hero's promise to return). All thermal bathing facilities at Raiden had closed by 2019, making this spring a historical designation rather than an active destination, yet the thunder-lightning name preserves the dramatic geological and mythological character of a coastal Hokkaido spring that once served the fishing and agricultural communities of the Iwanai area on the Sea of Japan coast. The spring's closure documents the ongoing demographic and economic challenges facing Japan's rural thermal spring tradition as communities shrink and the infrastructure of traditional onsen culture becomes increasingly difficult to maintain in remote coastal locations.