The Nissequogue River flows north from central Long Island to Long Island Sound. At its source are swamps and marshes, fed by fresh groundwater, which mixes with saline tidal waters from Long Island Sound in the northern tidal section of the River. Adjacent to the Nissequogue, the water table is higher in elevation than the surface of the river, therefore gravity causes the groundwater to seep into the River along its banks. As the tides rise and fall, the flow in the northern section of the River alternates between moving in an upstream and downstream direction, respectively.


Summer Flounder in the Nissequogue River on July 26, 2003. Click photo for its Flickr photo page.

The attachment contains overlays of USGS topographic maps that include the Nissequogue River and its watershed. They were downloaded from The USGS Store.

Google Earth Community: Long Island Sound
Google Earth Community: Long Island's Aquifer System
Google Earth Community: Long Island Digital Elevation Model
Google Earth Community: Surficial Sediments of Long Island Sound
Google Earth Community: Long Island's Coastal Features