Smurf's Backyard Ultra is set in tropical Cairns, Far North Queensland, Australia.

Traversing 6.7km's of the famous Smithfield Mountain Bike Trails, runners tackle a lap on the hour, every hour, until they can no longer continue!

Smurf's BYU also includes the Mini Backyard - an option for up to 6 laps for those not planning on going long.

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