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River, western Missouri, U.S. Formed by the junction of the Marais des Cygnes and Little Osage rivers, it is about 500 mi (800 km) long and is one of the principal tributaries of the Missouri River. It flows east and northeast through Lake of the Ozarks and enters the Missouri just east of Jefferson City, Mo.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Osage River, visit Britannica.com.
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