Duga Luka is located in the City of Labin, in Istra County at an elevation of 2 meters above sea level and it covers the area of 0.49 km² (0.19 sq. miles). According to the 2011 census report, there were 27 inhabitants. It is entirely populated by Croats. Nearby places: Sveta Marina, Crni, Gondolići, Rabac, Drenje, Bartići, Kranjci, Gora Glušići, Rogočana and Presika.