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Within the Echoriath, the Encircling Mountains, just west of Dorthonion and east of the River Sirion, lay a round level plain with sheer walls on all sides and a ravine and tunnel leading out to the southwest known as the Hidden Way.
He appeared before Tuor and urged him to go to Gondolin as a messenger to Turgon; when he got there he eventually married Turgon's daughter Idril and fathered Eärendil; Ulmo saved Eärendil's wife Elwing from the sack of the Havens of Sirion, allowing her to take a Silmaril to her husband, which allowed him to gain admittance to Valinor and plead for aid.