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The Drina is a river in the Balkan Peninsula. It is a 346 kilometer (215 mi)-long tributary of the Sava River, and it forms most of the border between Bosnia and Herzegovina and Serbia. Its name is derived from the Latin name of the river, Drinus.

The Drina is a very fast river with cold and greenish water, which is from the limestone which constitutes a major part of the area in which the river carved its bed.

The largest impact the river has had in culture probably is the novel "Na Drini ćuprija" (The Bridge on the Drina) by the Yugoslav Nobel Prize for literature laureate, Ivo Andrić; the book is about the building of a bridge near Višegrad by the Ottomans in the 16th century.

The Balkans is the historical name of a geographic region of southeastern Europe. The region takes its name from the Balkan Mountains, which run through the centre of Bulgaria into eastern Serbia. The region has a combined area of 550,000 km2 (212,000 sq mi) and a population of about 55 million people.
The ancient Greek name for the Balkan Peninsula was “the Peninsula of Haemus” (Χερσόνησος του Αίμου, Chersónisos tou Aímou).
The Balkans are adjoined by water on three sides: the Black Sea to the east and branches of the Mediterranean Sea to the south and west (including the Adriatic, Ionian, Aegean and Marmara seas).

The identity of the Balkans is dominated by its geographical position; historically the area was known as a crossroads of various cultures. It has been a juncture between the Latin and Greek bodies of the Roman Empire, the destination of a massive influx of pagan Slavs, an area where Orthodox and Catholic Christianity met, as well as the meeting point between Islam and Christianity.

The Balkans today is a very diverse ethno-linguistic region, being home to multiple Slavic, Romance, and Turkic languages, as well as Greek, Albanian, and others. Through its history many other ethnic groups with their own languages lived in the area, among them Thracians, Illyrians, Romans, Uzes, Pechenegs, Cumans, Avars, Celts, Germans, and various Germanic tribes.

The Balkan region was the first area of Europe to experience the arrival of farming cultures in the Neolithic era. The practices of growing grain and raising livestock arrived in the Balkans from the Fertile Crescent by way of Anatolia, and spread west and north into Pannonia and Central Europe.

In pre-classical and classical antiquity, this region was home to Greek city-states, Illyrians, Paeonians, Thracians, Epirotes, Mollosians, Thessalians, Dacians and other ancient groups. Later the Roman Empire conquered most of the region and spread Roman culture and the Latin language but significant parts still remained under classical Greek influence. During the Middle Ages, the Balkans became the stage for a series of wars between the Byzantine, Bulgarian and Serbian Empires.

en.wikipedia.org/wiki/Drina_River
en.wikipedia.org/wiki/Balkans