125-054 is a part of the Donau, a major river flowing through 10 countries in Central and Eastern Europe. It begins in Germany and flows through Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine before emptying into the Black Sea. The stretch of river between 125-054 is located in Slovakia, near the city of Bratislava. It is a relatively flat and slow-flowing portion of the river, surrounded by green meadows and small villages.