Naiads

Naiads or River Nymphs were the gods and goddesses who lived in rivers and streams. They were most commonly found in the Great River of Narnia. They are human-like in appearance and are spiritually tied to the waters of Narnia. No physical description is given, but in illustrations by Pauline Baynes, they are depicted as pretty women dressed in gowns in aquatic colors commonly in blue, and sometimes wearing crowns of rushes around their heads. There were male naiads as well as their father and chief the River god, who had a weedy beard. In The Magician's Nephew they are described as rising out of the river along with the river god, and they carried Queen Helen's train at her coronation. In The Lion, the Witch, and the Wardrobe, they are mentioned among Aslan's followers at the Stone Table. In Prince Caspian, they were awoken by Aslan at the begining of the reign of Caspian X. Despite them being mentioned in the books, they were not depicted in the first two films, and have finally appeared in the third film as replacements for the Sea People. They are portrayed in a simiilar maner to the dryads in that they non-physical beings using their element as their bodies, in this case water. Also they are depicted with fish tails like the merpeople instead of having legs.