Along the Adriatic Highway, there is Sopot cave, with the opening of 12 m wide and up to 4 m high
A corridor of similar dimensions stretches inside the cave, but after some twenty meters it widens up to 20–30 metres with the height declining to 2.5 metres. During the melting of snow in the hinterland, or heavy rainfalls, water gushes out of the cave opening and partly also through its submarine canal, discharging water up to 1.5 m above the sea level, forming concentric circles up to 100 m in diameter.