The walking tour begins and ends at the ornithological reserve of Veliko Blato. The reserve covers an area of 462 hectares. Veliko Blato is a depression with freshwater and a recorded number of 143 bird species. The ornithological reserve is of paramount importance for certain species of marsh birds because it is the last remaining place in Europe where they can land on their way to the south. Such well-preserved marsh territory is very rare nowadays, especially because of the increasing vulnerability of marsh ornithofauna and the disappearance of wetland biotopes across Europe.