Sveti Grgur (Croatian pronunciation: [svȇtī gr̂guːr]; lit.

Saint Gregory) is an uninhabited island in Croatia, on the Adriatic Sea between Rab and Krk.

The island was the site of a women's prison in SFR Yugoslavia, in tandem with nearby Goli Otok which served the same purpose for men, from 1949 to 1980.

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