The 6633 ultra is a non-stop self-sufficient multiday ultramarathon race of either 120 miles or 350 miles. These races take place partly within the Arctic Circle. The 350 mile race finishes on the shores of the Arctic Ocean at Tuktoyaktuk.
This race takes place in a challenging environment.
- The event name reflects the latitude in degrees and minutes of the location of the race within the Arctic Circle.
- Martin and Sue Like