| Leff | |
|---|---|
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&sq=Envato&lang=en&file=File:France_relief_location_map.jpg)  &sq=Envato&lang=en&file=File:Bretagne_region_relief_location_map.jpg) | |
| Location | |
| Country | France |
| Physical characteristics | |
| Mouth | Trieux |
• coordinates | 48°43′38″N 3°07′56″W / 48.7271°N 3.1322°W |
| Length | 62.4 km (38.8 mi) |
| Basin features | |
| Progression | Trieux→ English Channel |
The Leff (Breton: Leñv) is a river in Brittany, France. It is 62.4 km (38.8 mi) long.[1] It flows into the Trieux near Pontrieux.