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In page Hokkaido:

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The Nihon Shoki, finished in 720 AD, is often said to be the first mention of Hokkaidō in recorded history. According to the text, Abe no Hirafu[2] led a large navy and army to northern areas from 658 to 660 and came into contact with the Mishihase and Emishi. One of the places Hirafu went to was called Watarishima (渡島), which is often believed to be present-day Hokkaidō. However, many theories exist concerning the details of this event, including the location of Watarishima and the common belief that the Emishi in Watarishima were the ancestors of the present-day Ainu people.[citation needed]