Why not fly with Austrian Airlines to Zagreb? Zagreb is the largest city and capital of The Republic of Croatia. Along the Sava river, Zagreb is located in the northwestern part of Croatia in central Europe. The population there is 933,000. Zagreb is the home of the central government of Croatia and basically all the main bodies of its government. While there, be sure to see all of the historical buildings. There are many tours to take while in Croatia to economically explore the cities. Make sure to stop by the Jarun Lake, which is located a bit away from the noise of the big city. Here, you will find many sporting things to do and see some beautiful sites.