Spanish Main

1) the mainland of Spanish America, esp the N coast of South America from the Isthmus of Panama to the mouth of the Orinoco River, Venezuela

2) the Caribbean Sea, the S part of which in colonial times was the route of Spanish treasure galleons and the haunt of pirates

"....

We set sail for the Spanish Main
To rob the ships of the Queen of Spain
And she would be his pirate's bride
She gave him the pistol and the sword at his side

The tide rolls out, the tide rolls in
Without a care for the ways of men
I'd give three ships of Spanish gold
To see my love again

...."