The Neuse River is a river rising in the Piedmont of North Carolina and emptying into Pamlico Sound below New Bern. Its total length is approximately 275 miles (443 km), making it the longest river entirely contained in North Carolina. The Trent River joins it at New Bern. Its drainage basin, measuring 5,630 square miles (14,600 km²) in area, also lies entirely inside North Carolina. It is formed by the confluence of the Flat and Eno rivers prior to entering the manmade, artificial Falls Lake reservoir in northern Wake County.