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.

Zenica is the fourth-largest city in Bosnia and Herzegovina, and the capital of the Zenica-Doboj Canton of the Federation of Bosnia and Herzegovina entity. Zenica is located about 70 km north of Sarajevo and is situated on the Bosna river, surrounded by a mountainous and hilly landscape. The city is home to 115,134 inhabitants as of 2013.

The city's old quarter contains several attractions, including the former synagogue, dating from 1906, which is now part of the City Museum. There is also a mosque, an Austrian fountain and an old bey's farm house (Hadžimazića Kuća).

Zenica is connected with Sarajevo, by rail and road, both of which run along the valley of the river Bosna. The A1 motorway connects Zenica with Sarajevo and Mostar. The closest airport is Sarajevo International Airport. The railway line continues to the south, eventually reaching the coast at Ploče in Croatia.