Vienna

Vienna is the main and the largest city in Austria, divided into 23 districts. The city lies on the banks of the Danube, 40 km from the border with Slovakia and the Slovak capital Bratislava. Vienna has about 1.6 million inhabitants (one-fifth of the Austrian population). Symbol of Vienna is St. Stephen’s Cathedral, the seat of the Archbishop of Vienna, and a patron saint of the city is St. Leopold. The headquarters of several international organizations are located in Vienna: OPEC (Organization of Petroleum Exporting Countries), IAEA (International Atomic Energy Agency) and UNIDO (Industrial Development Organization of the United Nations).

Trebinje

Trebinje is the southernmost municipality and city in Bosnia and Herzegovina. Located in East Herzegovina, it is part of the Republika Srpska entity, and its population numbers 31,433. The city lies in the Trebišnjica river valley, at the foot of Leotar, some 30 km by road from Dubrovnik on the Adriatic coast.

There are several mills along the river, as well as several bridges, including three in the city of Trebinje itself, as well as a historic Ottoman Arslanagic bridge nearby. The river is heavily exploited for hydro-electric energy.

After it passes through the Popovo Polje area southwest of the city, the river - which always floods in the winter - naturally runs underground to the Adriatic, near Dubrovnik. Trebinje is known as "the city of the sun and platan trees", and it is said to be one of the most beautiful cities in Bosnia and Herzegovina. The city is economic and cultural center of the region of Eastern Herzegovina.