Anatoshi-iso Rock: Sculpted by the Sea
Anatoshi-iso Rock is an eye-catching natural phenomenon: three sea arches in one large offshore rock that has been eroded by waves. The rock’s strata are clearly visible and almost vertical, having been thrust up during the Cretaceous period, some 130 million years ago. The name consists of the kanji characters for “hole” (ana), “pass through” (toshi), and “seashore” (iso). Local fishermen offer excursions to the rock on their small boats. It can also be viewed from an observatory. The observatory is a short walk from a nearby parking lot, or it can be reached via a 90-minute hike on the Michinoku Coastal Trail from this Information Center.