CNNのインスタグラム(cnn) - 1月17日 01時27分

This massive, spinning ice disk formed in the frigid waters of the Presumpscot River in Westbrook, Maine. The rare phenomenon occurs when slow-moving, swirling water freezes more quickly than fast-moving water, creating a circle of ice. This ice mass, which is almost a football field in diameter, has drawn curious onlookers to the banks of the river.

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