At its deepest point, the Danube River is about 26.25 feet deep, while at its shallowest, it reaches a depth of approximately 2 feet. At its widest point, the river has about 4,921 feet between each bank. It travels from western Germany to the Black Sea along nine countries: Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania and Ukraine.
After the Volga River, the Danube River is the second-longest river in Europe, measuring a length of about 1,775 miles. The entire Danube River Basin has an area of 498,006 square miles. The river begins in Germany and ends in Bratislava in Slovakia, where it meets the Black Sea. The river current flows at a rate between 5 and 5.5 miles per hour.
The depth of this river permits river cruise ships to traverse it. It is one of the most popular river destinations because it flows through four national capitals, more than any other river in the world. In 1998, because of the increasing water traffic, the International Commission for the Protection of the Danube River was established with a goal to protect the animal life and water of the Danube.