The Aloja, dona d'aigua, dona de fum i d'aigua, encantada, goja, paitida or "water-woman" is Female water spirit that is often in the form of a young maiden with glorious, long hair and a robe, in Catalan mythology. They are often found near places of freshwater (such as ponds, torrents, waterfalls, forest springs, ravines, springs and humid caves with stone drips, where there are streams of water and underground lakes) during Saint John's Eve. They are unable to age and can be found washing their robes and combing their hairs. These women can fall in love with human men, giving them many blessings and riches, as long as the man does not reveal to anyone that his wife is an Aloja. Because if he does, All those riches disappear and the Aloja will leave him.
In Catalan popular bestiary, within Bellvei, the Aloja is given wings, making her represent a fairy.