The Alberta Triple
How does it work? - you must run three races, total mileage of the three equal to or greater than 420km.
Two 100 mile races (LSU, S7, IHU), and one 100+km (CDR 125, BFU, RVR, ILMR, LSU, REU, IHU 100km).
BFU100, Sin7 100M, LSU 100M
Sin7 100M, Ironlegs 100k, IHU 100M
CDR 125, LSU 100M, IHU 100M
Running all three 100 milers also gets you there if you are still alive at the end of the last one.