Koštabona
Koštabona is a village in the City Municipality of Koper in the Littoral region of Slovenia.
Name
Koštabona was attested in written sources in 1620 as Costabuona, and in 1763–87 as Costabona. The Slovene name Koštabona is borrowed from Italian. The name is a compound of costa 'slope' and bona 'good, fertile', referring to its physical location on a fertile promontory.Another theory, based on oral tradition, claims that in Late Antiquity Koštabona was the site of a Roman fortress named Castrum Bonae guarding the trade route through the Dragonja Valley, and that the name is derived from this. However, Italian has no co- reflex derived from this noun, and the expected Italian reflex of Latin castrum would be **castro, not costa.