 | This article relies largely or entirely on a single source. (September 2018) |
| Grenff | |
|---|---|
 Grenff at Neukirchen | |
 | |
| Location | |
| Country | Germany |
| State | Hesse |
| Physical characteristics | |
| Mouth | |
• location | Schwalm |
• coordinates | 50°53′5″N 9°15′25″E / 50.88472°N 9.25694°E |
| Length | 21.9 km (13.6 mi) [1] |
| Basin size | 86.4 km2 (33.4 sq mi) [1] |
| Basin features | |
| Progression | Schwalm→ Eder→ Fulda→ Weser→ North Sea |
The Grenff, also Grenf, is a 22 km[1] long, southeasterly tributary of Schwalm. It passes through the East Hesse Highlands in North Hesse Schwalm-Eder-Kreis, and belongs to the river system and catchment area of the Weser.