The Gulf Ecological Management Sites Program (GEMS) features an interactive viewing map for GEMS sites along the coast of the five US Gulf of Mexico states including Texas, Louisiana, Mississippi, Alabama, and Florida. GEMS is managed by the Gulf of Mexico Foundation in partnership with the EPA Gulf of Mexico Program and the five US Gulf States. The map viewer gives information a particular GEMS. It also gives you the ability to import layers from the web or on file onto different basemaps. For example, if you were looking at Guadalupe Delta Wildlife Management Area in Calhoun, Texas, you could select Terrain with Labels as your Basemap and discover that the Guadeloupe River runs through the area (shown in caption below the results). You could even add a population layer to see the size of the community in the surrounding area.
GEM Resource: Gulf of Mexico Foundation