Prepared and published by the National Imagery and Mapping Agency. Depths shown by isolines, soundings, and gradient tints. Relief shown by contours and spot heights. "From Brazilian surveys from 1961 to 1964." "Copyright 1996 by the United States Government. No copyright claimed under Title 17 U.S.C." "Soundings in meters." Map No. 24102. This map is part of a collection of scanned and georeferenced nautical charts produced by the National Geospatial-Intelligence Agency (NGA). United States. National Imagery and Mapping Agency. (1996). Brazil--Rio Guaíba, Ponta de Itapuã to Ponta do Arado Velho (Raster Image). LandInfo. Available at: https://purl.stanford.edu/bc996jp9181 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.