What is considered far far away? Is it somewhere we've never visited? Is it a place where we believe where nothing ever goes wrong? Where the prince will come for the princess? Where the flowers sing, and The moon watches over the night while the sun rest? Who knows? But the idea of being far far away is just to tell the kids so they'd never try to go there.
I will tell my kids, that they can travel as far far away as they can, and I'll be right there behind them when they do.
Fairy tales are to help us set goals in our lives.