Vrelo Bune is the natural and architectural ensemble at the Buna river spring near Blagaj kasaba (village-town) and a part of the wider "Townscape ensemble of the town of Blagaj - Historical and Natural Heritage of Bosnia and Herzegovina", southeast of Mostar, Bosnia and Herzegovina.It is impossible to separate the natural values from the cultural and historical heritage of Blagaj, since its distinctive quality is in the coexistence of the natural and the man-made, in the integration of the physical structure into the landscape.