Sanriku (三陸), sometimes known as Rikushū (陸州), lies on the northeastern side of the island of Honshu, corresponding to today's Aomori, Iwate and parts of Miyagi Prefecture and has a long history.
The 36 bays of this irregular coastline tend to amplify the destructiveness of tsunami waves which reach the shores of Sanriku,[1] as demonstrated in the damage caused by the 2011 Tōhoku earthquake and tsunami.