| Country | Germany |
|---|---|
| State | Rhineland-Palatinate |
| Reference no. | DE: 2712 |
| Length | 42.7 km |
| Source1 location | Near Himburg in the Upper Westerwald |
| Source1 coordinates | 50.57057°N 7.87064°E |
| Source1 elevation | 430 m |
| Mouth location | In Bendorf into the Rhine |
| Mouth coordinates | 50.418527°N 7.557478°E |
| Mouth elevation | 70 m |
| Basin size | 222.348 km² |
| Custom label | References |
The Sayn (frequently also called the Saynbach) is a small river, just under 43 kilometres (27 mi) long, in the south of the Westerwald hill region of Germany. It rises near Himburg in the Upper Westerwald and empties into the River Rhine in Bendorf (between the towns of Koblenz and Neuwied).