Arethusa. A wood nymph of Elis, in Greece, who, pursued by the River Alpheus, was changed into a fountain and ran under the sea. The waters of the fountain, mingled with the river, rose again in the fountain of Arethusa in the island of Ortygia, near Syracuse. According to another version of the same legend, it was Diana herself, and not the nymph Arethusa, whom the river-god of the Alpheus pursued; and when this pursuit ended in the island of Ortygia, then arose the fountain Arethusa.