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http://nhd.usgs.gov/ Home page for the National Hydrography Dataset, National Mapping Division, U.S. Geological Survey which has the NHDs comprehensive set of digital spatial data that contains information about surface water features such as lakes, ponds, streams, rivers, springs and wells.
http://hydrography.ims.plym.ac.uk/undergrad/hyd.htm Institute of Marine Studies University of Plymouth Faculty of Science defines hydrography as the branch of Marine Science concerned with the measurement and description of the nature and form of the sea bed.
http://cer.ori.u-tokyo.ac.jp/toolmap/Levitus-map.html Hydrographic map from NOAA World Ocean Atlas 1994 with an interactive tool to plot hydrographic maps using the dataset.
http://www.ocean-surveys.com/hydrography.htm A commercial site for Ocean Surveys, Inc. specializes in hydrographic, oceanographic, geophysical and geotechnical survey services that precisely chart underwater topography by employing the following technologies for this purpose: GPS vessel positioning, computerized navigation and data logging, single and dual frequency depth sounding, multibeam sweep surveying and towed sea sled profiling.
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