Bosnia and Herzegovina is a country on the Balkan peninsula of southern Europe with an estimated population of around 4 million people. It is known in the country's official languages as Bosna i Hercegovina although the name is commonly abbreviated to Bosnia, BiH. The country is a home to three ethnic "constituent peoples": Bosniaks, Serbs and Croats. The country is decentralized and is administratively divided into two entities, the Federation of Bosnia and Herzegovina and the Republika Srpska. Bordered by Croatia to the north, west and south, Serbia to the east, and Montenegro to the south, Bosnia and Herzegovina is landlocked, except for 20 km of the Adriatic Sea coastline, centered around the town of Neum.