Naustathmus or Naustathmos () was a port and anchorage on the coast of ancient Cyrenaica, 100 stadia from Apollonia.Periplus of Pseudo-Scylax, p. 45; Stadiasmus Maris Magni § 56;
Its site is located near Marsa Hilal, Libya. The remains which have been found there indicate an ancient site.
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