The southern part of the county consists of Dubrovnik and the surrounding area, including the Pelješac peninsula, and the islands of Korčula, Lastovo, Mljet, Šipan, Lopud and Koločep. The northern part of the county includes the Neretva Delta, the Baćina lakes north of Ploče, and a swath of hinterland near the southernmost slopes of Biokovo and around the hill of Rujnica.