Bukavac
The Bukavac is a demonic aquatic monster from Serbian and broader Slavic mythology, particularly associated with the region of Syrmia in modern-day Serbia. The creature's name derives from the Serbian word buka, meaning noise, referring to the terrifying sounds it makes as it emerges from its watery lair at night. The Bukavac is one of several lake-dwelling monsters in Slavic folklore, feared by those living near isolated lakes and ponds, where it was blamed for unexplained drownings and the mysterious disappearance of livestock near water's edge