The Dubrovnik–Neretva County (Croatian: Dubrovačko-neretvanska županija) is the southernmost Croatian county, located in south Dalmatia. The county seat is Dubrovnik and other large towns are Korčula, Metković, Opuzen and Ploče. The Municipality of Neum, which belongs to neighbouring Bosnia and Herzegovina, divides the county in two parts. The northern part of the Mljet island is a national park. The Lastovo archipelago is a designated nature park. The southernmost tip of the county is the demilitarized Prevlaka peninsula at the border with Montenegro.