The Element Encyclopedia of Witchcraft: The Complete A-Z for the Entire Magical World - Judika Illes 2005

Dones d’Aigua
Fairies

These are Catalonian spirits whose name literally means “Ladies of the Water.” They live anywhere where clean, fresh water can be found: springs, fountains, wells, and lakes including those within caves and forests. These Ladies of the Water guard hoards of treasure although, according to reports, they are usually very friendly and helpful to humans. They typically manifest as mermaids (half-woman/half-fish) or as sirens (half-woman/half-bird).