Mljet is an elongated island, with an average width of 3 km, 37 km long. Mljet is Croatia's greenest island with its Mediterranean vegetation, clear and clean sea, gentle sandy shoreline and a wealth of underwater sea life.
The climate is Mediterranean; an average air temperature in January is 48°F (9°C) and in July about 80°F (29°C).
The National Park Mljet was established in early sixties of last century. It covers about 30 square kilometers of area on the western bit of Island MLJET , which is about 1/3 of the Island.
Mljet is also well known for it's two salted lakes - Veliko and Malo Jezero that are located at the north end of the island. On small island in the middle of Veliko Jezero lake, there is old Benedictine monastery.