Mrzeżyno [mʐɛˈʐɨnɔ] (German: Deep, or Treptower Deep, after 1930 often Regamünde) is a village with a fishing seaport in Gryfice County. This is also a health resort with a lots of pensions, campsites and spa. It is located near the estuary of the Rega river. The village has a popular beach. Every year in July and August, Mrzeżyno is visited by many Polish and German tourists. The right riverside is more developed than left, where there is only one settlement. The population numbers 1,727⁽²⁰⁰⁹⁾.