This dataset includes hydrographic bodies of water (lakes/ponds,
swamps/marshes, ice masses, playas, and estuaries) within the Southern
Mojave/Salton Sea sub-region. This corresponds to sub-region 1810 (HUC
level 4) in the national Watershed Boundary Dataset (WBD). This is an
extract of the National Hydrography Dataset (NHD) - medium resolution
(1:100,000 scale). For further information on the NHD dataset, see http://nhd.usgs.gov/
U.S. Geological Survey; Conservation Biology Institute
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