Cemlyn Bay Beach is a shingle beach located in the North Wales, in the northwest coast of the Isle of Anglesey. It lies on a moon shaped bay, a very popular venue for shore and kayak fishing. The bay makes part of a Special Protection Area for birds, including the Skerris. It supports a maritime plant community, including sea kale, sea beet, see campion, yellow horned poppy. A lagoon can be found here, which is separated from the bay by the beach. The lagoon is fed by a couple of small streams.