Answer:
The Carpathian Mountains
Step-by-step explanation:
The mountain range that lies between the Holy Roman Empire and the Byzantine Empire are the Carpathian Mountains. These mountains are found in Central and Eastern Europe, across the countries of the Czech Republic, Austria, Slovakia, Poland, Hungary, Ukraine, Serbia, and Romania. This area if of enormous importance to the ecology of Europe. It contains one third of all European plant species, the second-largest surface of virgin forest and several thermal and mineral waters.