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.

Čačak is a city and the administrative center of the Moravica District of Šumadija and Western Serbia, and it's one of the main crossroads and economic centers of Serbia. The city has a unique morphological area in its surroundings, the Ovčar-Kablar Gorge, where 300 monasteries have been built since the 14th century, but only 12 remain today. This area is also called "Serbian Mount Athos."

In the vicinity of Čačak there are more than 20 churches and monasteries, the largest number found on such a small area in Serbia. They represent cultural and historic monuments of great significance. The most important ones are the Church of the Ascension of Jesus, a church on Ljubić hill dedicated to Saint Tsar Lazar, as well as the Vujan Monastery located on a nearby mountain of the same name. Special value is attributed to the monasteries of the Ovčar-Kablar Gorge, which as a cultural and historic whole date back to the Middle Ages and represent the particularity of the region's cultural and artistic heritage created over the centuries.

Thermal and mineral springs with medicinal properties provide the basis for the development of recreational tourism. There are three spa resorts within the territory of the city of Čačak: Gornja Trepča, Ovčar Banja and Slatinska Banja. There are also picnic sites: Gradina and the "Battle and victory" park (also called "Spomen" (remembrance) park) on the Jelica mountain, the Memorial complex on Ljubić hill, Grujine fields, rafts on West Morava river in Beljina, Parmenac, Međuvršje and Ovčar Banja, and picnic sites on the tiny rivers called Dičina, Kamenica, Čemernica and Banja.