Matching Pairs Fun facts about CroatiaOnline version Quiz about Croatia by Ant Dord 1 People say that it's the centre of the world. 2 A nature park, one of the largest and most beautiful wetlands in Europe. More than 250 different kinds of birds and more than 40 different kinds of fish live there. 3 The rarest plant in Croatia. It grows on Velebit. 4 The longest fortification (wall) in Europe. 5 Home to world's first Sea Organ. The waves and wind make music. 6 The smallest Croatian island on which people live. 7 The longest river in Croatia. 8 The smallest town in the world. Only 23 people live there. 9 The largest river in Croatia. 10 A city of four rivers. Zadar Karlovac degenija Kopački Rit Ston Ludbreg Krapanj Hum the River Kupa the Danube