Naiad

In Greek mythology, the naiads (; Ancient Greek: ναϊάδες, romanized: naïádes), sometimes also hydriads, are a type of female spirit, or nymph, presiding over fountains, wells, springs, streams, brooks and other bodies of fresh water. They are distinct from river gods, who embodied rivers, and the very ancient spirits that inhabited the still waters of marshes, ponds and lagoon-lakes such as pre-Mycenaean Lerna in the Argolis.