| Flat River | |
| Name Other: | Tributary to Neuse River |
| Map Size: | 300 |
| Pushpin Map: | USA North Carolina |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of Flat River mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | North Carolina |
| Subdivision Type3: | Counties |
| Subdivision Name3: | Person Durham |
| Length: | 19.23miles[1] |
| Discharge1 Location: | Falls Lake |
| Discharge1 Avg: | 184.31cuft/s at mouth with Eno River at Falls Lake[2] |
| Source1: | confluence of North and South Flat Rivers |
| Source1 Location: | about 10 miles north-northwest of Bahama, North Carolina[3] |
| Source1 Coordinates: | 36.2511°N -78.93°W[4] |
| Source1 Elevation: | 1540feet[5] |
| Mouth: | Eno River at Falls Lake |
| Mouth Location: | Durham, North Carolina |
| Mouth Coordinates: | 36.095°N -78.8133°W[6] |
| Mouth Elevation: | 252feet[7] |
| Progression: | Eno River → Neuse River → Pamlico Sound → Atlantic Ocean |
| River System: | Neuse River |
| Tributaries Left: | Deep Creek Dry Creek Rocky Creek |
| Waterbodies: | Lake Michie |
The Flat River is a river in southern Person County, North Carolina and a portion of Durham County, North Carolina.[8]
The river flows from Person County to combine with the Eno river to flow into the Neuse River. The river is the namesake for the township called Flat River, which has the highest census total of the 9 communities in Person County because it is mostly a combination of Hurdle Mills and Timberlake through which the river passes. North Carolina State University maintains a research forest within its watershed. Lake Michie, the principal reservoir for the city of Durham, is located on the lower reaches of the Flat River.