Hi,
I'm pretty sure the "The Isle of France" is an Island. This guy is shipwrecked from a ship called the Shamrock Green, and is washed up on The Isle of France, where he is met by a coastguard. That has got to be dry land ?
I've always had it in my mind that it was Madagasca, but a search of material at home last night has failed to confirm that, so God knows where I've got the idea!
Cheers
Paul