<P> According to the U.S. Census Bureau, the county has a total area of 257 square miles (670 km), of which 232 square miles (600 km) is land and 25 square miles (65 km) (9.6%) is water . </P> <P> Most of the southern three - quarters of Hart County is located in the Upper Savannah River sub-basin of the larger Savannah River basin, with the exception of two slivers of the county, south of Royston and west of Bowersville, which are located in the Broad River sub-basin of the Savannah River basin . The northern quarter of the county is located in the Tugaloo River sub-basin of the same Savannah River basin . </P> <Ul> <Li> Interstate 85 </Li> <Li> U.S. Route 29 </Li> <Li> State Route 8 </Li> <Li> State Route 17 </Li> <Li> State Route 51 </Li> <Li> State Route 59 </Li> <Li> State Route 77 </Li> <Li> State Route 77 Connector </Li> <Li> State Route 77 Spur </Li> <Li> State Route 172 </Li> <Li> State Route 180 </Li> <Li> State Route 281 </Li> <Li> State Route 403 (unsigned designation for I - 85) </Li> </Ul> <Li> U.S. Route 29 </Li>

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