|Location:||Near Iwanai. On the southwestern side of the Benkei-no-katanakake Rock (Benkei's sword rack).|
|Dimension:||L=120 m, H=16 m, W=4-20.|
|As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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This sea cave is entered by boat, boat tours are available from nearby fishing villages. The boats go in for about 60 m, until they reach a sandy beach. Another 60 m of cave can be visited by foot. The cave is inhabited by bats.
A legend tells, that an Ainu chief called Chipa, who was related to Yoshitsune, hid weapons and treasures here.