The Little Rock River is a 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 Rock River

Rock River (Iowa)

The Rock River is a tributary of the Big Sioux River, about long, in southwestern Minnesota and northwestern Iowa in the United States. Via the Big Sioux and Missouri rivers, it is part of the watershed of the Mississippi River.-Course:...

, 74.5 miles (119.9 km) long, in southwestern Minnesota

Minnesota

Minnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...

 and northwestern Iowa

Iowa

Iowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...

 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 Rock, Big Sioux

Big Sioux River

The Big Sioux River is a tributary of the Missouri River, long, in eastern South Dakota and northwestern Iowa in the United States. The United States Board on Geographic Names settled on "Big Sioux River" as the stream's name in 1961....

 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...

.

According to the Geographic Names Information System

Geographic Names Information System

The Geographic Names Information System is a database that contains name and locative information about more than two million physical and cultural features located throughout the United States of America and its territories. It is a type of gazetteer...

, it has also been known as "Little Rock Creek".

Course

The Little Rock River rises in Nobles County, Minnesota

Nobles County, Minnesota

Nobles County is a county located in the U.S. state of Minnesota. As of 2010, the population was 21,378. Its county seat is Worthington.-Geography:...

, 3 miles (5 km) west of the town of Worthington

Worthington, Minnesota

Worthington is a city in Nobles County, Minnesota, United States. The population was 12,764 at the 2010 census. It is the county seat of Nobles County.The city's site was first settled in the 1870s as Okabena Station on a line of the Chicago, St...

, and flows generally southwestwardly through Osceola

Osceola County, Iowa

Osceola County is a county located in the U.S. state of Iowa. It is named for Seminole war chief Osceola. The population was 6,462 in the 2010 census, a decline from 7,003 in the 2000 census. The county seat is Sibley, named for H. H. Sibley of Minnesota....

 and Lyon

Lyon County, Iowa

-2010 census:The 2010 census recorded a population of 11,581 in the county, with a population density of . There were 4,848 housing units, of which 4,442 were occupied.-2000 census:...

 counties in Iowa, where it passes the towns of Little Rock

Little Rock, Iowa

Little Rock is a city in Lyon County, Iowa, United States, along the Little Rock River. The population was 489 at the 2000 census.-Geography:Little Rock is located at ....

 and George

George, Iowa

George is a city in Lyon County, Iowa, United States, along the Little Rock River. The population was 1,051 at the 2000 census. The ZIP Code for George is 51237.-Geography:George is located at ....

. It flows into the Rock River 1.5 miles (2.4 km) southwest of Doon

Doon, Iowa

Doon is a city in Lyon County, Iowa, United States, along the Rock River. The population was 533 at the 2000 census. The BNSF, or Burlington, Northern & Santa Fe Railway, passes through Doon.-History:...

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