|Country||Bosnia and Herzegovina|
|• location||Vrelo Bune near Blagaj|
|The Neretva near Buna|
|Length||9 km (5.6 mi)|
|Progression||Neretva→ Adriatic Sea|
The Buna (Serbian Cyrillic: Буна) is a short river in Bosnia and Herzegovina; it is a left bank tributary of the Neretva. Its source (Vrelo Bune), a strong karstic spring, is near the village Blagaj, southeast of Mostar. It is best known for the Buna Spring (Vrelo Bune), one of the strongest springs in Europe and extremely cold water. The Buna flows west for approximately 9 km, starts at Blagaj and meandering through villages Blagaj, Kosor, Malo Polje, Hodbina and joins the Neretva at settlement Buna. The Bunica river is main left bank tributary of the Buna.