Misty Mountains
The Rivendell valley may be based upon the valley of Lauterbrunnen in Switzerland, where Tolkien had gone hiking. Tolkien indeed stated that "From Rivendell to the other side of the Misty Mountains, the journey ... including the glissade [of Bilbo and the Dwarves] down the slithering stones into the pine woods ... is based on my adventures in Switzerland in 1911".