Flatrock Creek is a 57.2 miles (92.1 km) tributary of the Auglaize River

Auglaize River

The Auglaize River is a tributary of the Maumee River in northwestern Ohio in the United States. It drains a primarily rural farming area in the watershed of Lake Erie. The name of the river either comes from a Shawnee phrase meaning "fallen timbers" or a French term for "frozen water."It rises in...

 in northeastern Indiana

Indiana

Indiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...

 and northwestern Ohio

Ohio

Ohio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...

 in the United States

United States

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

. It drains a primarily rural farming area in the watershed of Lake Erie

Lake Erie

Lake Erie is the fourth largest lake of the five Great Lakes in North America, and the tenth largest globally. It is the southernmost, shallowest, and smallest by volume of the Great Lakes and therefore also has the shortest average water residence time. It is bounded on the north by the...

.

It rises in a group of headwater streams along the border between Adams County, Indiana

Adams County, Indiana

Adams County lies in northeastern Indiana in the United States and shares its eastern border with Ohio. It was officially established in 1836. The county seat is Decatur....

 and Van Wert County, Ohio, approximately 8 miles (13 km) northeast of Decatur, Indiana

Decatur, Indiana

Decatur is a city in Root and Washington townships, Adams County, Indiana, United States. The city, which serves as the county seat of Adams County, takes its name after the prominent war hero Stephen Decatur, Jr., one of the captains of the original 6 frigates of the US navy...

. The creek flows northwest from Ohio into eastern Allen County, Indiana

Allen County, Indiana

As of the census of 2000, there were 331,849 people, 128,745 households, and 86,259 families residing in the county. The population density was 505 people per square mile . There were 138,905 housing units at an average density of 211 per square mile...

, then turns northeast at Monroeville, Indiana

Monroeville, Indiana

Monroeville is a town in Monroe Township, Allen County, Indiana, United States. The population was 1,235 at the 2010 census.-Geography:Monroeville is located at ....

 and flows into Paulding County, Ohio

Paulding County, Ohio

As of the census of 2000, there were 20,293 people, 7,773 households, and 5,689 families residing in the county. The population density was 49 people per square mile . There were 8,478 housing units at an average density of 20 per square mile...

, past Payne

Payne, Ohio

Payne is a village in Paulding County, Ohio, United States. The population was 1,166 at the 2000 census.-Geography:Payne is located at .According to the United States Census Bureau, the village has a total area of , all of it land....

 and Paulding

Paulding, Ohio

Paulding is a village in and the county seat of Paulding County, Ohio, United States. It is located predominantly in Paulding Township. The population was 3,595 at the 2000 census.-History:...

. It joins the Auglaize from the west approximately 10 miles (16.1 km) southwest of Defiance

Defiance, Ohio

As of the census of 2000, there were 16,465 people, 6,572 households, and 4,422 families residing in the city. The population density was 1,562.4 people per square mile . There were 7,061 housing units at an average density of 670.0 per square mile...

.