Boljunčica is a river in inland Istria, Croatia.

Its average discharge at the measurement station in Polje Čepić (covering 183 km2 of the basin) is 0.956 m3/s, and it can go completely dry.

[1] Boljunčica rises on the western slopes of the Učka mountain and flows to the south.

Near Polje Čepić and Potpićan, it goes underground and emerges near Plomin.

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