[Mithalwen]

Barbara Strachey deals with this on map 13 of "The Journeys of Frodo", which is far mor detailed. She says of the Loudwater "This must have been much closer than it appears in the maps...which are included in ...the Lord of the Rings. I believe, in fact, that the Loudwater must have made as sharp westward turn beforeswinging southagain to join the Hoarwell. As shown in the map the two would have been some 100 miles apart and the hill would have had to have been a high mountain for to have been visible. Furthermore Aragorn says it runs along the Loudwater for many miles before the Ford (Flight to the Ford)"

Barbara Strachey wasn't a professional cartographer but she was very thorough.