Croatia is an Eastern European country with long coastlines on the Adriatic Sea, encompassing more than a thousand islands, crossed by the Dinaric Alps and dotted with castles. Its inland capital, Zagreb, is distinguished by its medieval Gornji Grad (Upper Town) and diverse museums. The major coastal city Dubrovnik has massive 16th-century walls encircling an Old Town with Gothic and Renaissance buildings.The country (56,594 km² – 4.3 million inhabitants) is bordered by Hungary to the northeast, Serbia to the east, Bosnia & Herzegovina to the southeast, Montenegro to the southeast, the Adriatic Sea to the southwest and Slovenia to the northwest.