Groundwater Systems

USGS Water Resources of the U.S.: This site contains publications, data, programs, and more links about water. Maintained by the United States Geological Survey.

Canadian Groundwater Issues: Canadian groundwater reports. Maintained by the National Water Research Institute of Canada.

Yellowstone Geysers: Pictures of Yellowstone geysers and basins. Maintained by Janet and John Anderson.

Virtual Cave: Pictures of various cave environments. Maintained by Djuna Bewley.
Mammoth Cave photos: Pictures of Mammoth Cave. Maintained by Vadim Aristov.
Earth and Ocean Sciences Image Collections: This extensive photo gallery contains photographs of various glacial features together with a brief description. Maintained by the University of British Columbia.

Ground Water Primer: Reviews many aspects of groundwater movement and contamination. Maintained by the Environmental Protection Agency Region 5 and Agricultural & Biological Engineering, Purdue University.