Dobro is a small fraction settlement connected with the hamlet-port of Koromačno in Istria County, Croatia. It consists of apartments buildings which were used by workers of the near by cement factory. It was named from the antique map which shows Dobro, Priponje,(not developed) and Punta Kromatz (became hamlet-port Koromačno and the Cement factory) Punta Nera (not developed). Koromačno is the coastal hamlet with a port which the cement factory export the cement by sea.
Note on Dobra, Istria
http://www.catasti.archiviodistatotrieste.it/Divenire/document.htm?idUa=10652011&idDoc=10659784&first=16&last=16 This is the Map of the area showing where Dobro is actually. Spelling of "Dobro" is in German. Austria-Hungary was in control at those times.
References
Dobro (Istria) Wikipedia(Text) CC BY-SA