This is a recent (December 20) look at Onneto.
Snow covers the lake surface, but brushing it away reveals frozen trees and ice bubbles.
As noted previously, walking on a frozen lake is very dangerous. For details on how to reach the lake in winter, please see the link below (tourism association website).
https://www.town.ashoro.hokkaido.jp/kanko/spot/onneto_area/spot-13.html...
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