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Sanriku Fukkō NP, Iwate
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Taiko-iwa (“Drum Rock”) is the geological odd one out: Otoko-iwa and Onna-iwa were once connected to the nearby cliffs and eroded free, but Taiko-iwa is a detached block that rolled from nearby strata. Its tilted layers give it away.
A 2-meter sea-eroded cave pierces Otoko-iwa, the central “Man Rock.” Local lore says passing through it brings good luck—a charming bit of folklore attached to this 37-meter sea pillar.
Edo-period records remember Sannoiwa as 山王嶋 (Sanno-jima), a place of worship as well as a scenic cluster of strange rocks. The old description shows that this rugged coast mattered to people as more than a striking view.
Near Sannoiwa, a boulder estimated to weigh more than 200 tonnes was shifted about 30 meters from its former position by the March 11, 2011 tsunami. Its new resting place makes the wave’s force startlingly tangible.
Beside the Sannoiwa trail, the Japanese red pine nicknamed the “Indomitable Sanno Pine” survived the direct hit of the March 11, 2011 tsunami. Miyako City presents it as a living reminder of the coast’s recovery.
About two-fifths of 37-meter Otoko-iwa is rounded-conglomerate Raga Formation, capped by sandstone of the Tanohata Formation. The sharp boundary exposes distinct layers of the roughly 100-million-year-old Miyako Group.
