The biodiversity of Great Britain and Ireland is one of the most well-studied geographical areas of its size in the world.
This biota work has resulted in the publication of distribution atlases for many taxonomic groups.
A full atlas is generally regarded as a definitive work on distribution, whereas a provisional atlas is typically produced as an interim stage to show survey progress.
One of the bodies responsible for publishing a great number of distribution atlases is the Institute of Terrestrial Ecology.
The atlases are produced by the Biological Records Centre (BRC), which is run by the Institute of Terrestrial Ecology, part of the Centre for Ecology and Hydrology based at CEH Wallingford, Crowmarsh Gifford, Oxfordshire.