They are among the oldest salt basins in Europe and the only ones that have been producing salt for more than 1000 years. The particularity of these natural environments is a swampy vegetation growing around the basin, which significantly enriches the karst, the abyss and the impoverished flora  habitats on the Pag Island. Here one can find different bird species such as the nesting ones, migratory and regular wintering birds. Some basins are covered with unique plant life of the saltbush (halophytes) and thus, except for vegetation, provide optimal conditions for chiefly the marsh birds species. Due to the variety and richness of the species here, the salt production plants are particularly interesting to bird watchers because they can provide a real pleasure for watching some species such as black-winged stilt, tern, kentish plover, gray plover and white and grey heron..