Big Sioux
geographical name
river 420 miles (676 kilometers) long in South Dakota and Iowa flowing south to the Missouri River and forming the Iowa–South Dakota boundary
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“Big Sioux.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Big%20Sioux. Accessed 5 Nov. 2024.
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Merriam-Webster unabridged
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