The Vale of Tumladen - watercolor

[...] 'Ulmo himself appeared to him, and bade him go forth again alone into the Vale of Sirion; and Turgon went forth, and by the guidance of Ulmo he discovered the hidden vale of Tumladen in the Encircling Mountains, in the midst of which there was a hill of stone.'

J. R. R. Tolkien, Silmarillion, Of the Return of the Noldor


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Gondolin is behind your back...