Letnica is a river of Poland, a tributary of the Obra. The river flows through the town of Grodzisk Wielkopolski.

Letnica
Letnica (river) is located in Poland
Letnica (river)
Location of the mouth in Poland
Location
CountryPoland
VoivodeshipGreater Poland
Physical characteristics
Source 
 • locationZdrój, Greater Poland Voivodeship
 • coordinates52°13′52″N 16°17′34″E / 52.23111°N 16.29278°E / 52.23111; 16.29278
Mouth 
 • location
Obra
 • coordinates
52°06′50″N 16°25′26″E / 52.11389°N 16.42389°E / 52.11389; 16.42389