The Marmaton River is a 102 miles (164.2 km) tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 of the Little Osage River

Little Osage River

The Little Osage River is an tributary of the Osage River in eastern Kansas and western Missouri in the United States. Via the Osage and Missouri rivers, it is part of the watershed of the Mississippi River.-Course:...

 in southeastern Kansas

Kansas

Kansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...

 and western Missouri

Missouri

Missouri is a US state located in the Midwestern United States, bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska. With a 2010 population of 5,988,927, Missouri is the 18th most populous state in the nation and the fifth most populous in the Midwest. It...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. Via the Little Osage, Osage

Osage River

The Osage River is a tributary of the Missouri River in central Missouri in the United States. The Osage River is one of the larger rivers in Missouri. The river drains a mostly rural area of . The watershed includes an area of east-central Kansas and a large portion of west-central and central...

 and Missouri

Missouri River

The Missouri River flows through the central United States, and is a tributary of the Mississippi River. It is the longest river in North America and drains the third largest area, though only the thirteenth largest by discharge. The Missouri's watershed encompasses most of the American Great...

 rivers, it is part of the watershed

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 of the Mississippi River

Mississippi River

The Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...

.

Course

The Marmaton River rises in Kansas northeast of Moran

Moran, Kansas

Moran is a city in Allen County, Kansas, United States. As of the 2010 census, the city population was 558.-Geography:Moran is located at . According to the United States Census Bureau, the city has a total area of , all of it land....

 in eastern Allen County

Allen County, Kansas

Allen County is a county located in southeast Kansas, in the central United States of America. As of the 2010 census, the county population was 13,371...

 and flows generally eastward through Bourbon County

Bourbon County, Kansas

Bourbon County is a county located in Southeast Kansas, in the Central United States. As of the 2010 census, the county population was 15,173...

 in Kansas and Vernon County in Missouri, past the towns of Uniontown

Uniontown, Kansas

Uniontown is a city in Bourbon County, Kansas, United States. As of the 2010 census, the city population was 272.-Geography:Uniontown is located at , along the Marmaton River...

, Redfield

Redfield, Kansas

Redfield is a city in Bourbon County, Kansas, United States. The population was 140 at the 2000 census.-Geography:Redfield is located at , along the Marmaton River....

 and Fort Scott

Fort Scott, Kansas

Fort Scott is a city in and the county seat of Bourbon County, Kansas, United States, south of Kansas City, on the Marmaton River. As of the 2010 census, the city population was 8,087. It is the home of the Fort Scott National Historic Site and the Fort Scott National...

 in Kansas and Deerfield

Deerfield, Missouri

Deerfield is a village in Vernon County, Missouri, United States. The population was 75 at the 2000 census.-Geography:Deerfield is located at , along the Marmaton River....

 in Missouri. It joins the Little Osage River from the south, 7 miles (11 km) south-southeast of Rich Hill, Missouri

Rich Hill, Missouri

Rich Hill is a city in Bates County, Missouri, United States. The population was 1,461 at the 2000 census.The current mayor of Rich Hill as of April 2011 is Jim Kithcart.-Geography:Rich Hill is located at ....

.