The North Pole
So how does Rudolph do it? Travelling all those miles on Christmas Eve without barely having to stop for breath. Well, now we know his secret.
Scientists in Norway have discovered that reindeer keep cool by using special tactics such as panting with their mouths closed to evaporate water from the nose.
No wonder Rudolph's is so red and bright!
The furry polar animals also have a built-in cooling system that chills the blood supply to the brain, so they don't overheat when they're dashing through the snow, carrying toys to all the boys and girls around the world.