§ Of the Beginning of Days The Silmarillion

But Ulmo was alone, and he abode not in Valinor, nor ever came thither unless there were need for a great council; he dwelt from the beginning of Arda in the Outer Ocean, and still he dwells there. Thence he governs the flowing of all waters, and the ebbing, the courses of an rivers and the replenishment of Springs, the distilling of all dews and rain in every land beneath the sky. In the deep places he gives thought to music great and terrible; and the echo of that music runs through all the veins of the world in sorrow and in joy; for it joyful is the fountain that rises in the sun, its springs are in the wells of sorrow unfathomed at the foundations of the Earth. The Teleri learned much of Ulmo, and for this reason their music has both sadness and enchantment. Salmar came with him to Arda, he who made the horns of Ulmo that none may ever forget who once has heard them; and Ossë and Uinen also, to whom he gave the government of the waves and the movements of the Inner Seas, and many other spirits beside. And thus it was by the power of Ulmo that even under the darkness of Melkor life coursed still through many secret lodes, and the Earth did not die; and to all who were lost in that darkness or wandered far from the light of the Valar the ear of Ulmo was ever open; nor has he ever forsaken Middle-earth, and whatsoever may since have befallen of ruin or of change he has not ceased to take thought for it, and will not until the end of days.