Spring of Una
Una springhead is a unique karstic phenomenon located near Srb. On Lika’s frontier, just at the border with Bosnia and Herzegovina starts the flow of river Una (212 km long, half of its stream runs through Croatia). At this exact secluded place is the springhead of Una – „unique river „as the old Romans called it. Depth of the springhead is still not fully explored – for now, we know of 248m (2016.), making it world’s 5th deepest karstic spring. It has been protected as a hydrological nature monument in 1968. for its outstanding hydro geological importance, beauty and uniqueness.