KAMISHIHORO, Hokkaido --- "Ice bubbles" on the surface of a frozen lake in Japan's northernmost prefecture are attracting photographers keen to catch a glimpse of the beautiful disk-shaped formations created by nature.
The bubbles appear in Lake Nukabira in the town of Kamishihoro, Hokkaido, when gas and other substances at the bottom freeze near the surface and become trapped in multiple layers. This phenomenon is usually seen only for a short period of time after the surface of the lake freezes and before snow forms a thick covering on top.
There was a slight accumulation of snow on Jan. 6, so the ice bubbles could be observed after sweeping it away. As more snow piles up, it will gradually become harder to see this beautiful natural art.
(Japanese original by Taichi Kaizuka, Hokkaido Photo Group)