The Naka River (, Naka no Kawa; Literally meaning "River of Southern Joy") is a river flowing through Konohagakure. The river is located on the land where the Uchiha clan once lived and prospered and at some point, it passes through a deep ravine. It was at this river that Shisui "erased his existence", but it was thought that Itachi had drowned him.
Naruto: The Shinobi's Shroud [Open]
A little more than your average Naruto guild