...After two days the wind fell from its ravening fury and was soon no more than a vague whisper; and the skies cleared, leaving a bright azure vault from horizon to horizon. But nowhere was there any land visible, only a waste of waters that still roared and tossed turbulently without wind, pouring ever westward in a tide too swift and strong for the galley to stem. And the galley was borne on irresistibly by that strange current, even as by the hurricane.
Yadar, who was the sole passenger, marveled much at this thing; and he was struck by the pale terror on the faces of the captain and crew. And, looking again at the sea, he remarked a singular darkening of its waters, which assumed from moment to moment a hue as of old blood commingled with more and more of blackness: though above it the sun shone untarnished. So he made inquiry of the captain, a graybeard from Yoros, named Agor, who had sailed the ocean for forty summers; and the captain answered:
'This I had apprehended when the storm bore us westward: for we have fallen into the grip of that terrible ocean-stream which mariners call the Black River. Evermore the stream surges and swiftens toward the place of the sun's outermost setting, till it pours at last from the world's rim. Between us now and that final verge there is no land saving the evil land of Naat, which is called also the Isle of Necromancers. I know not which were the worse fate, to be wrecked on that infamous isle or hurled into space with the waters falling from earth's edge. From either place there is no return for living men such as we. And from the Isle of Naat none go forth except the ill sorcerers who people it, and the dead who are raised up and controlled by their sorcery. In magical ships that breast the Black River, the sorcerers sail at will to other strands; and beneath their necromancy. to fulfill their wicked errands, the dead men swim without pause for many nights and days whither-so-ever the masters may send them.'