The change happened whilst I slept. Its details I shall never know; for my slumber, though troubled and dream-infested, was continuous. When at last I awaked, it was to discover myself half sucked into a slimy expanse of hellish black mire which extended about me in monotonous undulations as far as I could see, and in which my boat lay grounded some distance away.
Though one might well imagine that my first sensation would be of wonder at such a prodigious and unexpected transformation of scenery, I was in reality more horrified than astonished; for there was in the air and in the rotting soil a sinister quality which chilled me to the very core. The region was putrid with the carcasses of decaying fish, and of other less describable things which I saw protruding from the nasty mud of the unending plain. Perhaps I should not hope to convey in mere words the unutterable hideousness that can dwell in absolute silence and barren immensity. There was nothing within hearing, and nothing in sight save a vast reach of black slime; yet the very completeness of the stillness and the homogeneity of the landscape oppressed me with a nauseating fear.
The sun was blazing down from a sky which seemed to me almost black in its cloudless cruelty; as though reflecting the inky marsh beneath my feet. As I crawled into the stranded boat I realised that only one theory could explain my position. Through some unprecedented volcanic upheaval, a portion of the ocean floor must have been thrown to the surface, exposing regions which for innumerable millions of years had lain hidden under unfathomable watery depths. So great was the extent of the new land which had risen beneath me, that I could not detect the faintest noise of the surging ocean, strain my ears as I might. Nor were there any sea-fowl to prey upon the dead things.
[Dagon, Lovecraft, H. P.]