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Why was William Parry unable to continue through M’Clure Strait?

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Map of the Arctic region highlighting the Northwest Passage, a maritime route shown with a red line connecting the Atlantic Ocean near Greenland to the Pacific Ocean via the Canadian Arctic Archipelago, passing north of Canada and Alaska through the Bering Sea. Major islands and surrounding countries such as Russia, Norway, Denmark (Greenland), the United States (Alaska), and Canada are labeled.
Northwest Passage

William Parry was unable to continue through M’Clure Strait because his progress was blocked by ice. During his 1819–1820 voyage, Parry successfully navigated through Lancaster Sound to Melville Island, where he wintered, but he could not proceed further due to the ice conditions in the strait.1