The entire western part of Mljet Island is a national park. There are two small saltwater lakes (Great Lake and Small Lake), a church and a monastery from the 12th century, which is now a restaurant. There are also plenty of hiking trails. http://www.mljettravel.com/national-park.html.
The island used to be infested with snakes, but since the Indian mongoose was introduced in 1911, the snakes are now almost gone.
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