Alas (geography)
Shallow depression formed by subsidence of the Arctic permafrost / From Wikipedia, the free encyclopedia
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Alas (Yakut: Алаас) is a shallow depression which occurs primarily in Yakutia, which is formed by subsidence of the Arctic permafrost owing to repeated melting and refreezing. An alas first develops as a shallow lake as melt water fills the depression. The lake eventually dries out and is replaced by grasses and other herbaceous vegetation.