"In Greek mythology, the Nereids (/ˈnɪəriɪdz/ NEER-ee-idz; Greek: Νηρηΐδες Nereides, sg. Νηρηΐς Nereis) are sea nymphs (female spirits of sea waters), the 50 daughters of Nereus and Doris, sisters to Nerites. They often accompany Poseidon, the god of the sea, and can be friendly and helpful to sailors, like the Argonauts in their search for the Golden Fleece." - (en.wikipedia.org 31.01.2020)
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