Editing Warren County, Ohio (section)

==Geography==
According to the [[United States Census Bureau]], the county has a total area of {{convert|407|sqmi}}, of which {{convert|401|sqmi}} is land and {{convert|6.0|sqmi}} (1.5%) is water.<ref name="GR1">{{cite web|url=https://www.census.gov/geo/maps-data/data/docs/gazetteer/counties_list_39.txt|publisher=United States Census Bureau|access-date=February 11, 2015|date=August 22, 2012|title=2010 Census Gazetteer Files|url-status=dead|archive-url=https://web.archive.org/web/20140504223453/http://www.census.gov/geo/maps-data/data/docs/gazetteer/counties_list_39.txt|archive-date=May 4, 2014}}</ref> The county is a rough square with the sides about {{convert|20|mi|km}} long.

===Adjacent counties===
* [[Montgomery County, Ohio|Montgomery County]] (northwest)
* [[Greene County, Ohio|Greene County]] (northeast)
* [[Clinton County, Ohio|Clinton County]] (east)
* [[Clermont County, Ohio|Clermont County]] (south)
* [[Hamilton County, Ohio|Hamilton County]] (southwest)
* [[Butler County, Ohio|Butler County]] (west)

===Boundaries===
Warren County was created by the first [[Ohio General Assembly]] in the Act of March 24, 1803, which also created Butler and Montgomery Counties. The act defined Warren County as "all that part of the county of Hamilton included within the following bounds, viz.: Beginning at the northeast corner of the county of Clermont, running thence west with the line of said county to the [[Little Miami River|Little Miami]]; thence up the same with the meanders thereof to the north boundary of the first tier of sections in the second entire range of townships in the [[Symmes Purchase|Miami Purchase]]; thence west to the northeast corner of Section No. 7 in the third township of the aforesaid range; thence north to the [[Great Miami River|Great Miami]]; thence up the same to the middle of the fifth range of townships; thence east to the County line; thence with same south to the place of beginning." Originally this included land now in [[Clinton County, Ohio|Clinton County]] as far east as [[Wilmington, Ohio|Wilmington]].

Clinton County proved a continuing headache to the legislature. The Ohio Constitution requires that every county have an area of at least four hundred square miles (1,036&nbsp;km<sup>2</sup>). Clinton County's boundaries were several times adjusted in an effort to comply with that clause of the constitution. One of them, the Act of January 30, 1815, detached a strip of land from the eastern side to give to Clinton. That would have left Warren under four hundred square miles (1,036&nbsp;km<sup>2</sup>), so a portion of Butler County (the part of [[Franklin Township, Warren County, Ohio|Franklin Township]] where [[Carlisle, Ohio|Carlisle]] is now located) was attached to Warren in compensation. The 1815 act was as follows:
* Section 1—That all that part of the county of Butler lying and being within the first and second fractional townships in the fifth range, and adjoining the south line of Montgomery County, shall be and the same is hereby attached to and made part of the county of Warren.
* Section 2—That eleven square miles 28&nbsp;km<sup>2</sup> of the territory of the county of Warren and extending parallel to the said eastern boundary of Warren County, along the whole length of such eastern boundary from north to south, shall be and the same is hereby attached to and made a part of the county of Clinton."
Except for the sections formed by the Great and Little Miamis, the sides are all straight lines.

===Lakes and rivers===
The major rivers of the county are the [[Great Miami River]], which flows through the northwest corner of the county in [[Franklin Township, Warren County, Ohio|Franklin Township]], and the [[Little Miami River]] which zig-zags across the county from north to south. There is one sizable lake, the [[Caesars Creek Reservoir]], created by a [[U.S. Army Corps of Engineers]] dam on Caesars Creek in the northeast part of the county in [[Massie Township, Warren County, Ohio|Massie Township]].