Buško Blato lake, as well as entire watershed system, is a man-made, draining waters of karst aquifer of poljes of Western Herzegovina and Western Bosnia regions, in the heart of Bosnia and Herzegovina Dinaric Alps. These are almost exclusively sinking rivers, draining waters of Livanjsko Polje, Duvanjsko Polje and Kupreško Polje through system of ponors and estavelles (sinkholes), subterranean flows, and karstic wellsprings.