herein. Descriptions of the benthic character from videotapes of the bottom at these stations and at 29 others are also presented.Past and present depositional agents have affected the topography and surficial sediment distribution in Fishers Island Sound. Gravelly sediments tend to dominate the central axis of the sound, offshore from points, and on bathymetric highs where tidal currents are the strongest. Sandy sediments surround these gravelly deposits and dominate the remainer of the sound. The finer-grained muddy sediments are confined to harbors and enclosed bathymetric lows.