Duba Pelješka is located in the municipality Trpanj, in Dubrovnik-Neretva County at an elevation of 5 meters above sea level and it covers the area of 10.01 km² (3.86 sq. miles). According to the 2011 census report, there were 46 inhabitants. It is predominantly populated by Croats (97%), but also. Nearby places: Stanković, Podgorje, Donja Vrućica, Orebić, Kučište, Viganj, Nakovanj, Korčula, Trpanj and Gornja Vrućica.