WWF - Ecoregions
- Detailed descriptions and images of the world's ecoregions. Javascript required.
- http://www.worldwildlife.org/wildplaces/about.cfm

MBGnet
- Descriptions and images of the biomes of the world, freshwater ecosystems, and marine ecosystems. From the Missouri Botanical Garden.
- http://mbgnet.mobot.org/

Ecosystem Information
- Information related to ecosystems in the Pacific and Yukon regions of Canada, including state of the environment reporting, environmental indicators, and programs and reports on ecosystem science, monitoring and research.
- http://www.ecoinfo.ec.gc.ca/

A Mysterious Journey - Rainforest, Desert, Grassland
- Educational site about the 3 major biomes of the world, rainforest, desert and grassland.
- http://www.thinkquest.org/library/site_sum.html?tname=26634&url=26634/

Millennium Ecosystem Assessment
- Reports from international effort to inventory global ecosystems, their contribution to human development, and the effect of the ongoing degradation of ecosystem services on human well-being.
- http://www.millenniumassessment.org/

Len Webb Ecological Images Collection
- Photographs by ecologist Len Webb depict a wide variety of native vegetation, fauna, landscapes, and soils, mainly in tropical and subtropical Northeastern Australia. Represents a wide range of ecosystem types.
- http://www.gu.edu.au/ins/collections/webb/

Ecological Society of America Panel on Vegetation Classification
- Constituted by the Ecological Society of America to support and facilitate the creation of standardized, scientifically credible North American vegetation type classification.
- http://www.esa.org/vegweb/

The State of the Nation's Ecosystems
- Online book about the current status and trends of the environment of the United States, aimed at public policy makers and concerned citizens.
- http://www.heinzctr.org/ecosystems/

Images of the Dry Tropics
- Photographs of plants, animals, and landscapes from dry tropical habitats in the Americas, Africa, Madagascar, and Asia. Dry tropical habitat types include tropical dry forest, tropical deciduous forest, thorn forest, spiny desert, savannah, cerrado, and
- http://www.explorelifeonearth.org/drytropics.html

Terrestrial Ecoregions of the World
- Maps, descriptions, and index to 687 ecoregions across the globe. Javascript required.
- http://www.nationalgeographic.com/wildworld/terrestrial.html

The World's Biomes
- Introduction to aquatic, desert, forest, grassland, and tundra biomes. School class project.
- http://www.ucmp.berkeley.edu/glossary/gloss5/biome/

Biomes - Living Worlds
- Fact sheets, photos, and video clips on the climate, location, animal and plant adaptations, land formations, and human influences of seven major terrestrial biomes: tundra, taiga, temperate forest, grassland, chaparral, desert, and rainforest.
- http://library.thinkquest.org/C0113340

The Buell-Small Succession Study
- A long term old-field permanent-plot ecological succession study on the New Jersey Piedmont.
- http://www.ecostudies.org/bss/

WorldBiomes
- Covering five of the major world biomes.
- http://www.worldbiomes.com/