Covering the western third of Mljet island, this national park features two interconnected saltwater lakes -- Veliko Jezero and Malo Jezero -- surrounded by dense Mediterranean forest. In the middle of the larger lake sits the islet of St. Mary with a 12th-century Benedictine monastery. The park is one of the greenest islands in the Adriatic, with cycling paths, swimming spots, and kayak rentals. Ferries run from Dubrovnik and the Peljesac peninsula.
Covering the western third of Mljet island, this national park features two interconnected saltwater lakes -- Veliko Jezero and Malo Jezero -- surrounded by dense Mediterranean forest. In the middle of the larger lake sits the islet of St. Mary with a 12th-century Benedictine monastery. The park is one of the greenest islands in the Adriatic, with cycling paths, swimming spots, and kayak rentals. Ferries run from Dubrovnik and the Peljesac peninsula. Entrance fee: adults from €10 to €20. Best months: May, June, September, October. Highlights: Two saltwater lakes, Benedictine monastery on St. Mary's islet, cycling trails, kayaking, Odysseus Cave, pristine beaches.