How many countries touch the Danube river?

"Known to history as one of the long-standing frontiers of the Roman Empire, the river flows through — or forms a part of the borders of — ten countries: Germany (7.5%), Austria (10.3%), Slovakia (5.8%), Hungary (11.7%), Croatia (4.5%), Serbia (10.3%), Romania (28.9%), Bulgaria (5.2%), Moldova (1.7%), and Ukraine (3.8%). In addition, the drainage basin includes parts of nine more countries: Italy (0.15%), Poland (0.09%), Switzerland (0.32%), Czech Republic (2.6%), Slovenia (2.2%), Bosnia and Herzegovina (4.8%), Montenegro, Republic of Macedonia, and Albania (0.03%)."

the river flows through — Germany (7.5%), Austria (10.3%), Slovakia (5.8%), Hungary (11.7%), Croatia (4.5%), Serbia (10.3%), Romania (28.9%), Bulgaria (5.2%), Moldova (1.7%), and Ukraine (3.8%).

In addition, the drainage basin includes parts of nine more countries: Italy (0.15%), Poland (0.09%), Switzerland (0.32%), Czech Republic (2.6%), Slovenia (2.2%), Bosnia and Herzegovina (4.8%), Montenegro, Republic of Macedonia, and Albania (0.03%).".

In addition, the drainage basin includes parts of nine more countries: Italy, Poland, Switzerland, Czech Republic, Slovenia, Bosnia and Herzegovina, Montenegro, Republic of Macedonia, and Albania.

A drainage basin is an extent of land where water from rain or snow melt drains downhill into a body of water

the percentages refer to what percent of the river is in contact with that particular country

Edit: haha! ninja'd