World's End (location) fabled end of the world, lying far to the west of the Island of Cos . Those with Second Knowledge know this to be but a salior's tale, and that Gor, like Earth, is round
We did not know where lay the world’s end, but we knew where It must be sought. The world’s end was said to lie beyond Cos and Tyros, at the end of Thassa, at the world’s edge. No man had sailed to the world’s end and returned. It was not known what had occurred there. Some said that Thassa was endless, and there was no world’s end, only the green waters extending forever, gleaming, beckoning the mariner and hero onward, onward until men, one by one, had perished and the lonely ships, their steering oars lashed in place, pursued the voyage in silence, until the timbers rotted and one day, perhaps centuries later, the brave wood, warm in the sun, sank beneath the sea.
“The ship is ready,” said Samos, looking at me.
Others said, in stories reminiscent of Earth, and which had doubtless there had their origin, that the world’s end was protected by clashing rocks and monsters, and by mountains that could pull the nails from ships. Others said, similarly, that the end of the world was sheer, and that a ship might there plunge over the edge, to fall tumbling for days through emptiness until fierce winds broke it apart and the wreckage was lifted up to the bottom of the sea. In the maelstroms south and west of Tyros shattered planking was sometimes found. It was said that some of this was from ships which had sought the world’s end
Book 12, Beast of Gor pp. 27-28