Description: U.S. National Atlas Volcanoes represents volcanoes thought to be active in the last 10,000 years (Holocene), in and near the United States. The data is a subset of data available from the Global Volcanism Program, Smithsonian Institution.
Description: U.S. National Atlas Water Feature Lines represents the linear water features (for example, aqueducts, canals, intracoastal waterways, and streams) of the United States.
Description: U.S. National Atlas Water Feature Areas represents the water feature areas (for example, bays, glaciers, lakes, and swamps) of the United States.