Thunder, high waves, lush land

[madam]

Hi Everyone
I am still looking for this 'ecology' type song out the same time as supernature and crystal world.(1974-76)
It is sung by a female and the story goes like this;
There is a clap of thunder, they go sailing and the waves become very rough and high and when they think they are going to drown, they reach a lost land where the nature is lush and big. Maybe another clap of thunder half way through?
Don't want to influence anyone but I think the title might have 'voyage' or 'waves' in it. It is definately not fantastic voyage by lakeside. Also the artist may have a french name -les.....????
Thanks a bundle :o :roll: