Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Approximate locations of some recent USGS coastal and offshore fieldwork. Dark blue areas outline the US Exclusive Economic Zone; US Great Lakes waters shown in purple.
Public Domain.
