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Nakassie

The Nakassie (ナカッシー) is an aquatic cryptid reported from Nakaumi, a brackish lake in Yasugi City, Shimane Prefecture, Japan.

On June 20, 2021, at about 8:00 a.m., a man fishing in Nakaumi spotted a huge black object moving in the water offshore and took a video of it. This video was featured on a local TV news station and was also posted on a news web site. Reports at the time estimated the creature's total length at about 10 meters, while cryptid researcher Takeshi Nakazawa estimated it at 3 meters.

In November 2024, Takeshi Nakazawa conducted a field survey at Nakaumi and found no traces specifically related to Nakassie.

Nakazawa thought it unlikely that the creature in the video was a group of small creatures, and also assumed that it was not a dolphin, since its fins were not visible. He also mentioned the possibility that the cryptid is actually a wave.

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