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Started in 1981, Llyn Brianne Observatory is one of the longest running catchment projects in the world.

The site is typical of upland freshwater ecosystems. Originally established to investigate acid rain, the Observatory has pioneered research into the effects of land use, pollution and global change on stream biodiversity, ecological function and ecosystem services.

Long term ecological research sites, such as Llyn Brianne, are crucial to understanding environmental change and solving the challenges faced by the environment and society. Through its high quality science, the Observatory supports researchers, land managers, environmental charities, statutory organisations and communities in using these natural assets wisely and for a sustainable future.

Experimental cascading streams set in upland countryside


Our world class facilities are available to staff, students and collaborators.

Team of researchers adding leaves to a stream as part of an experiment


Key contacts for the Llyn Brianne Observatory.

Map of UK rivers

Partners and sponsors

Freshwater research undertaken at Llyn Brianne benefits from paired experiments at partner facilities and data collected from similar field sites.