The Voglajna (pronounced [ʋɔˈɡlaːi̯na]) is a river in Styria, Slovenia. The river is 35 kilometres (22 mi) long (including its source river, the Ločnica), and its catchment area is 412 km2 (159 sq mi).[1] Its source is Lake Slivnica (Slovene: Slivniško jezero) near Slivnica pri Celju. It passes Šentjur, the ruins of Rifnik Castle, and Štore, and then merges with the Savinja River in Celje.