The Slavic water spirit that appears as a beautiful maiden is the Rusalka. Rusalki are female supernatural beings associated with rivers, lakes, springs, and, in some regional traditions, forests or fields.
Descriptions vary widely. They may appear as pale, beautiful young women with long, loose hair, sometimes resembling mermaids in modern retellings. Older and regional folklore is more complicated: some rusalki were connected with fertility and springtime, while nineteenth-century accounts often portrayed them as dangerous spirits of the dead who lured people into water.
The rusalka should not be confused with the Vodyanoy, generally a male water spirit, or with the Vila, a broader nature spirit found in South and West Slavic traditions. The word is linked to the medieval festival term “Rusalia,” ultimately connected with the Latin Rosalia and Byzantine Greek rousália. Antonín Dvořák’s 1901 opera helped popularize the figure internationally.