Costa Ártabra, or Golfo Ártabro, is a coastal area of Galicia, Spain. It is comprised between the costa da Morte and the Rías Altas; it has a maximum width of 5,800 metres, and a depth of 5,600 metres corresponding to the mouth of the at Santa Cristina beach. Other rivers which have their mouth in the gulf include and .
It corresponds to what the Greco-Roman geographers Strabo, Pomponius Mela and Pliny the Elder designated as Portus Magnus Artabrorum, a region inhabited by the Artabri people, of Celtic origin.
Costa Ártabra also the name of a nature reserve, a "Special Area of Conservation". This is one of the areas in which the rare Kerry slug is known to occur.
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