Biserujka, also known as Omišaljska špilja, Vitezić špilja or Slivanjska jama is a cave located 6 km northeast of Dobrinj, in the village of Rudine, above the Slivanjska Bay, in the island of Krk, Croatia.

An undistinguished stone house in the middle of a bare karst landscape hides the entrance to a cave 12 m under the surface.

It has typical features such as stalactites and stalagmites,[3] and also a gallery or hall, which is suitable for the holding of concerts.

However, because of the low temperature, about 13 °C, people cannot stand being there for long periods of time, so only short musical pieces are performed.

[4] This Primorje-Gorski Kotar County geography article is a stub.