Just below Afon Dulyn the river is joined by Afon Melynllyn, a small river flowing from neighbouring Llyn Melynllyn.
Ceunant Dulyn, or the Dulyn Gorge, has been designated a Site of Special Scientific Interest (SSSI) since 1 January 1961 as a conservation measure to protect the site on account of its wildlife.
Natural Resources Wales is the body responsible for the site.
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