Akkorokamui
Akkorokamui (Japanese: アッコロカムイ; Ainu: At-kor-kamuy) is a gigantic octopus-like monster from Ainu folklore, similar to the Nordic kraken, which supposedly lurks in Uchiura Bay in Hokkaido.
It is said that its enormous body can reach sizes of up to 1 hectare (110,000 square feet) or roughly 100 metres (330 feet) or more across.