quicksands

from Easton's 1897 Bible Dictionary
Quicksands
found only in Acts 27:17, the rendering of the Greek Syrtis. On
the north coast of Africa were two localities dangerous to
sailors, called the Greater and Lesser Syrtis. The former of
these is probably here meant. It lies between Tripoli and Barca,
and near Cyrene. The Lesser Syrtis lay farther to the west.
    

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