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Gridded sidescan and bathymetry data from the Eel River Basin swath mapping survey. Colors are derived from side scan backscatter data, with warmer colors (red and yellow) indicating high backscatter, and cooler colors (blue and purple) indicating low backscatter. Shading is derived from artificial sun illumination of bathymetry (azimuth N25degE). Contours are in meters. Principal features discussed in the text are identified.