Bosnia and Herzegovina, sometimes called Bosnia-Herzegovina, and often known informally as Bosnia, is a country in Southeastern Europe located on the Balkan Peninsula. Sarajevo is the capital and largest city. It is bordered by Croatia to the north and west; Serbia to the east; Montenegro to the southeast; and the Adriatic Sea to the south, with a coastline about 20 kilometres (12 miles) long surrounding the town of Neum. In the central and eastern interior of the country the geography is mountainous, in the northwest it is moderately hilly, and the northeast is predominantly flatland. The inland, Bosnia, is a geographically larger region and has a moderate continental climate, with hot summers and cold and snowy winters. The southern tip, Herzegovina, has a Mediterranean climate and plain topography.