I couldn't seem to find any lyrics for this song recorded by Artie Trezise so I thought I'd take a stab at adding them.
I think I have most of it although I wasn't sure about a word in the third verse, "and the onward ??? do roll."
It sounds like it should be obvious but I'm drawing a blank.

NANCY BELL
As sung by Artie Trezise

A sailor and his ain true love went out one day to walk
To view the fields and valleys and to have a pleasant talk
To hear the wee birds whistle and the lark in the air soar high
For it is so nice and charming for to hear the young ones cry

And for every sigh that Nancy gave it was for her Jimmy dear
And on her red and rosy cheek shone mony's the sorrowful tear
For I hear you're going to leave me love and it grieves my heart fu' sair
For I hear that you're bound for the West in days, and ne'er to return again

Oh my Nancy, oh my Nancy, I'm sorry to complain
But who has put in your fancy love, that I'll never return again?
For when I'm on the ocean wide and the onward ??? do roll
I will crown ye queen o' my Nancy Bell, you're the girl I do adore

So she's tain the ring frae off her finger and gaed it to her true love
Saying "Tak ye this my Jimmy as a token o' true love"
Saying "Tak ye this my Jimmy and wear it on your right hand,
"It will keep ye in mind o'a broken heart when you're oot in a foreign land"

So he's lifted up his anchor, the ship being ready to sail
Doon the Firth and awa' he went wi' a soothing pleasant gale
Aye doon the Firth and awa' he went, the water being cauld and clear
And it's there that he's tain his last fare weel to the girl he loves sae dear

Sae fair thee weel until bonny Dundee for it is my native shore
And thrice fare weel tae Nancy Bell, she's the girl I do adore
And if I should return again, as I hope someday that I will
I will mak' ye my ain sweet wedded wife, and me charming Nancy Bell