"The Water Is Wide" (also called "O Waly, Waly") is thought to be an English or Scottish folk song that has been sung since the 1600s and has seen considerable popularity through to the 21st century. (Wikipedia)
This is probably one of the prettiest folk songs that exists. Here it is sung by a world famous New Zealander Hayley Westenra. In 2006, she joined Celtic Woman.
The water is wide, I cannot get over
Where love is planted O there it grows
The ship there is and she sails the sea
Oh love is gentle, love is kind