She is a river mermaid. She is a tradition of northern Argentina, related to the Brazilian mae de agua. She is depicted as a beautiful blonde woman who strokes her hair with a golden comb.
The Mayuj Mama rides the first wave of the river’s flood, going in and out of its waters, although on moonlit nights or during the siteas she tends to hang from the trees along the riverbank. This mermaid announces the arrival of floods, but she can also drag men to the bottom of the waters to drown them.