Fifty North and Forty West

WHEN the cabin port-holes are dark and green
Because of the seas outside;
When the ship goes wop (with a wiggle between)
And the steward falls into the soup-tureen,
And the trunks begin to slide;
When Nursey lies on the floor in a heap,
And Mummy tells you to let her sleep,
And you aren't waked or washed or dressed,
Why, then you will know (if you haven't guessed)
You're "Fifty North and Forty West!"

This is a poem by Rudyard Kipling
In the story "How the Whale got his Throat" in the book Just So Stories it is written that latitude Fifty North, longitude Forty West is Magic.