Boromir and his search for Rivendell

[Boromir88]

Aye, I am unsure if this info would have been available in Gondor Rivendell was in a valley and it was well hidden. Elrond established it as a refuge, and I don't think Sauron ever found it's location and I doubt many in Gondor (by this time) would have known.

Both Faramir and Boro went to Denethor about the dream they had to go to Imladris. Denethor was supposedly the wisest loreman in Gondor and it seemed he was only able to give a rough idea of the location. Add to that Boro lost his horse in Tharbad, and you get a long journey.

Edit:

I seem to remember reading that Arnor and Gondor were jointly responsible for the maintenance of the Great Road up till the middle of the Third Age. Surely that implies an interchange of knowledge ?~MoS

Not necessarily, joint maintenance of roads is not always pleasant let me tell you. If you ever wonder why County line roads in the U.S are some of the worst in shape, it's because the two counties always argue about who should do what - or some of the bridges over train tracks, I am always in arguments with train companies over who is responsible. And I don't want to go into the "communication" back-n-forth if you can even call it that.