Ar Lan y Môr (Beside the Sea) is a traditional Welsh folk song. Various forms of the text exist, including some where the metre and subject of some verses suggest insertions from other unrelated songs. The song is a love song. As with many other Welsh songs, there are alternative words set to the same tune.
Bryn Terfel recorded "Ar Lan y Môr" on his 2000 album We'll Keep a Welcome.
References
Ar Lan y Môr Wikipedia(Text) CC BY-SA