Avery Island

Avery Island, Louisiana is located about 45 miles south of Lafayette, Louisiana.  It is one of the so-called "Five Islands".  It is not a true island, however it is and elevated mound surrounded by Holocene coastal marshes. This island is one of the salt domes still in operation today.  However, the mines are no longer open to the public because of the hazards they propose.
 

The image below shows some of the canals and marshes associated with these dome features.
 

This picture shows better evidence of the elevation by the sloped hillside.  Notice the change in the tree-line.