Marais des Cygnes
Marais des Cygnes (mĕrˈē də sēn) [key], river, c.140 mi (230 km) long, rising in E central Kans., SW of Topeka, and flowing SE into W Mo. to join the Little Osage River and form the Osage River. Subject to heavy flooding, the river has many flood control projects.
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