In the first case in March 1999 the SDF chased two North Korean spy ships and fired warning shots after the ships were spotted off the NotoPeninsula in Ishikawa Prefecture.
WSJ: Japan on Alert Over Unidentified Submarines
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Oku-noto no Aenokoto is an agricultural ritual transmitted from generation to generation by the rice farmers of the NotoPeninsula, which projects from Ishikawa prefecture in the centre of Japan s main island, Honshu.