"polynya : (hydrology, oceanography) A naturally formed area of open water surrounded by sea ice,..."

“polynya : (hydrology, oceanography) A naturally formed area of open water surrounded by sea ice, especially in the Arctic.
Today is World Oceans Day, a day recognized by the United Nations to highlight the importance of conserving and protecting the world’s oceans.”

- https://en.wiktionary.org/wiki/polynya#English

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