Plina Jezero is located in the City of Ploče, in Dubrovnik-Neretva County at an elevation of 100 meters above sea level and it covers the area of 22.77 km² (8.79 sq. miles). According to the 2011 census report, there were 37 inhabitants. It is entirely populated by Croats. Nearby places: Peračko Blato, Brečići, Kobiljača, Dubrave, Mali Prolog, Staševica, Pozla Gora, Borovci, Ploče and Šarić Struga.