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What features divide the Amerasia Basin into the Makarov Basin and Canada Basin?

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The Amerasia Basin is divided into the Makarov Basin and the Canada Basin by the Alpha Cordillera (also known as the Alpha Ridge).1

This feature is a broad, rugged, and seismically inactive submarine mountain chain that extends to within 4,600 feet of the ocean surface. The Makarov Basin is situated between the Alpha Cordillera and the Lomonosov Ridge, while the Canada Basin—the largest subbasin of the Arctic Ocean—extends from the Alpha Cordillera to the Beaufort Shelf.1