Big Sioux

geographical name
\ ˈsü How to pronounce Big Sioux (audio) \

Definition of Big Sioux

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 8 May. 2021.

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