You are here: Home / Sites / Site pages / Lakes / Llyn Llagi

Llyn Llagi

The Llyn Llagi ECN site

© Ewan Shilland

Site page

Full details about site…


Other organisations involved in ECN activities at site

Selected related publications

Note: Search our Publications Catalogue for a more
complete list of publications relating to this site

Llyn Llagi occupies a north-facing corrie in the central area of the Snowdonia region of North Wales. The lake lies at 380 m beneath a steep backwall and comprises a deep, almost circular basin (maximum depth 16.5 m) bordered by an extensive shallow (1 m deep) rim. The lake covers an area of 5.67ha and the primary inflow constitutes the outflow stream from Llyn yr Adar. The lake drains to the north-west, to the Nanmor valley.

The catchment (157 ha) consists primarily of Ordivician slates and shales of the Glanarfon series. The catchment soils are mainly stagnopodsols and gleys, interspersed with blanket peats. The vegetation is characterised by Calluna (heather), Molinia (purple moor-grass) and Eriophorum (cotton grass), and the catchment is grazed at a low intensity by sheep. The lake and much of the catchment lie within a designated Site of Special Scientific Interest (SSSI). Llyn Llagi is classified as having high acid deposition, which is why it is monitored regularly as part of the Upland Waters Monitoring Network.