A karst field is a large, flat-floored depression found in limestone landscapes, formed by the long-term dissolution of soluble rocks combined with tectonic activity. These distinctive features are among the most prominent elements of karst topography and can extend over several kilometers. What makes karst fieldss particularly fascinating is their ecological importance. They serve as dynamic and diverse habitats that support a wide range of wildlife adapted to extreme and changing conditions.

            Red-footed Falcons are remarkable migratory birds that visit Herzegovina’s karst fields during their spring migration. They typically arrive in the second half of April, taking advantage of the abundant insect life in the open landscapes. These falcons feed primarily on large insects - mainly Mayflies, skillfully catching them in flight over the karst fields. At peak times, large flocks can be observed soaring and hunting together, creating a spectacular display in the skies. They depart in the second half of May to continue journey northward.

            Rivers on karst fields are unique because they often disappear underground through sinkholes and reappear elsewhere as springs. These rivers flow across flat, fertile depressions surrounded by limestone hills, where water drainage is largely controlled by subterranean channels. During heavy rainfall, the underground passages may become blocked, causing temporary flooding of the field. This alternating pattern of flooding and drying creates diverse habitats and supports rich ecosystems. Overall, rivers on karst fields illustrate the dynamic interaction between surface and underground water in karst landscapes.

            The sinking rivers of Herzegovina’s karst fields harbor several endemic fish species specially adapted to their changing environments. During the dry summer months, these fish retreat into underground streams through sinkholes, where water remains cool and stable. With the return of spring rains, they re-emerge into surface waters to feed and reproduce, perfectly attuned to the seasonal rhythm of the karst landscape.

            The Beautiful Demoiselle is a striking damselfly commonly found along clear, fast-flowing rivers in Herzegovina. Its metallic blue or green body and shimmering wings make it one of the most elegant insects in the region’s karst landscapes. Often seen fluttering near riverbanks, it is a symbol of the pristine freshwater ecosystems that characterize Herzegovina’s natural beauty.

            In spring, karst fields burst into vibrant floral displays, with wildflowers carpeting the fertile plains between limestone hills. These blooms reflect the rich biodiversity supported by the region’s unique mix of wet and dry habitats.

            Bee-eaters on the karst fields of Herzegovina are thriving, their colorful flocks brightening the open landscapes. These striking birds are doing very well, nesting in sandy riverbanks or sand quarries and feeding on the abundant insects of the region.

            The European glass lizard, often mistaken for a snake, is a legless lizard commonly found on the karst fields of Herzegovina. It thrives in the region’s open grasslands and rocky edges, where it hunts insects and small vertebrates.

            The Eastern Orphean Warbler is an elusive songbird often found around the scrubby edges and woodlands of Herzegovina’s karst fields. This shy yet striking species thrives in the region’s warm Mediterranean climate, where long, sunny seasons provide ideal conditions for nesting and feeding.

            The Red-rumped Swallow first appeared on the karst fields of Herzegovina in the 1980s, during its westward and northward expansion across Europe. Originally a more eastern species, it spread rapidly through the Balkan Peninsula as part of a major range increase that began in the 1970s. In Herzegovina, it quickly adapted to the Mediterranean climate and open landscapes, often nesting under bridges and in culverts. Today, the species is a regular summer visitor.

            Nightingales return to the karst fields of Herzegovina in the first week of April, when their rich songs announce the start of spring. Males arrive first, giving them time to establish territories and advertise their presence to migrating females. They prefer dense shrubs and riverbanks surrounding the open fields, where food and shelter are plentiful.