Frozen asset: You can just see artist Jim Denevan at the centre of this detail from his extraordinary twelve and a half mile square drawing. Using the frozen black ice beneath the white snow as a canvas, Jim and his team lived in a native tent, or 'yurt' which was set up on the frozen ice surface.
'This is the largest drawing in the world and beats my previous record which was a sand drawing in the desert of Nevada, which had a circumference of nine miles,' said California resident Jim.