Boats travelling up and down Anduin and Lorien's isolation.

[Morthoron]

Originally Posted by The Mouth of Sauron

In the Fellowship of the Ring Aragorn stated that light boats used to travel from Wilderland down to Osgiliath. Surely if they had, they would have sailed past Lorien and contact would have been made with the elves that lived there?

Yet the impression is given that there was little or no such contact throughout the Third Age.

Men, like those of Rohan, treated Lothlorien superstitiously or even with fear. One might be aware that the Elves inhabited Lorien, but it's another thing altogether to visit such a perilous realm.