Conversation so far:
where is rhine river located on a map
what is the rhine river known for
The Rhine River is culturally and historically one of the great rivers of the European continent and among the most important arteries of industrial transport in the world.
how long is the rhine river
The length of the Rhine was long given as 820 miles, but in 2010 a shorter distance of about 765 miles was proposed.
which cities are on the rhine river's banks
No other river besides the Rhine has so many old and famous cities on its banks—Basel, Switzerland; Strasbourg, France; and Worms, Mainz, and Cologne, Germany, to name a few.

Question: how many countries does the river pass through
Self-contained rewrite: how many countries does the rhine river pass through