Bordered in Black (#8)

1966-04Known Space: Prototype Short StoryFantasy and Science Fiction, April 1966

anthology, SF:3, Author's Choice, edited by Harry Harrison;
Shape of Space, The
Convergent Series
Inconstant Moon
Best of Larry Niven, The
De Stranden Van Serius Vier
Carver Rappaport, Winston Turnbull, William "Wall" Kameon stand-alone, not a Known Space story though the Hyperspace "blind spot" was later incorporated into Known Space.

First appeared in Fantasy and Science Fiction, April 1966. Earth's first hyperspace explorers travel via the new Overcee drive to visit the stars in the Sirius System. Only one returns. He brings back tales of a habitable planet with a large continent that's mysteriously bordered in black...