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The border of Romania and Bulgaria is pretty much the Danube, at probably its widest. There appears to be only two bridges across this border over the Danube, One bridge in Vidin (too far east to make sense with any route) and one in Ruse according to Wiki "Sidewalks for pedestrians are also included" but not sure if that means its rideable. Other than that it's ferries, which might be fair to assume are well established given the few bridges.
giofox
Can we talk about the ferry, anyone got a good understanding to explaing it. I believe they're between Cp4 and finish? And maybe 250km from finish. But I just glanced and am busy.