Sunriku, sometimes known as Rikushu, 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, as demonstrated in the damage caused by the 2011 Tohoku earthquake and tsunami.
On January 19, 1869, in the aftermath of the Boshin War, the provinces of Mutsu and Dewa were divided. Mutsu was split into new five provinces: Rikuo (also read Mutsu), Rikuchu, Rikuzen, Iwashiro and Iwaki.
The new provinces were short-lived, being abolished in July 1871 when the abolition of the han system redivided Japan into its present prefectures. However, the label lives on in common usages such as the Sunriku Coast, which extends along Japan's Pacific coastline from Aomori in the north down to the Oshika Peninsula in Miyagi.
Iwate Prefecture is the second largest prefecture of Japan after Hokkaido. It is located in the Tohoku region of Honshu island and contains the island's easternmost point. The capital is Morioka. Iwate has the lowest population density of any prefecture outside Hokkaido. Famous attractions include the Buddhist temples of Hiraizumi, including Chuson-ji and Motsu-ji with their treasures, Fujiwara no Sato, a movie lot and theme park in Esashi Ward, Oshu City, Tenshochi, a park in Kitakami City known for its big, old cherry trees and Morioka Castle in Morioka City.
Miyagi Prefecture is a prefecture of Japan in the Tohoku region on Honshu island. The capital is Sendai.