Not sure, but I looked into doing this myself and there were some warnings about bandits in Romania! as far as I'm aware the country you enter from outside the EU is considered the border then as long as you travel within the EU you should be OK, I guess any country reserves the right to check documents if they want...find out which countries are EU (I'm no expert) and check the US embassy website for advice.
at the time I was considering this, path wasn't completed but long sections did exist including out of Vienna....but that was a few years ago, hopefully you could ride all the way now....someone must have a page or two up about it if you care to google.
There are boat services aren't there? so maybe you could sail downstream (faster?) and ride back....now that would be nice if time was limited.
Not sure, but I looked into doing this myself and there were some warnings about bandits in Romania! as far as I'm aware the country you enter from outside the EU is considered the border then as long as you travel within the EU you should be OK, I guess any country reserves the right to check documents if they want...find out which countries are EU (I'm no expert) and check the US embassy website for advice.
at the time I was considering this, path wasn't completed but long sections did exist including out of Vienna....but that was a few years ago, hopefully you could ride all the way now....someone must have a page or two up about it if you care to google.
There are boat services aren't there? so maybe you could sail downstream (faster?) and ride back....now that would be nice if time was limited.