Hello everyone!

First, I apologize for any mistakes as English isn’t my mothertongue.

I’m looking for a horror movie described by a friend to me, but he didn’t remember the title.
The movie poster represents a child with long dark hair standing behind a tree trunk or a wooden post. His head is turned to the side. The background of the poster is white.

This movie talks about a Japanese legend saying that children should not play along water. In the beginning, old people are dying from a disease. Then children went missing while playing along a stream at certain times of the day. It seems that they are taken by a sort of snake/dragon creatures/demons.
I hope someone can help me. In the meantime, thank you for reading!

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“the host” was a japanese water monster film, with the monster made because of toxic chemicals. that isn’t the poster for it though