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Approximate altitude of base of fresh groundwater, in feet below National Geodetic Vertical Datum of 1929 (Nyman, 1984, pl. 2)-Freshwater underlain with saltwater 0 to 199 200 to 399 400 to 599 600 and deeper Area where no major aquifer contains freshwater-Water with a chloride concentration less than or equal to 250 milligrams per liter A A' 07381600 07385765 Marsh and swamp Western boundary of the Atchafalaya aquifer (Saucier, 1994) Southern and eastern extent of fresh groundwater Line of section (fig. 3)

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