The most recent edition of this event was on 24 March 2018.
The Arrowsmith Thee Races in Canterbury, New Zealand on Saturday, 25 March 2017 has several running and mountain bike events, and a MTB / trail run duathlon.
The trail runs are the Arrowsmith High Country 42km Marathon, Lake Face 17km Trail Run, and 10/11km Fun Run. The MTB event is 42km mountain bike option covering the same course, and the duathlon is the 42km MTB course, followed by the 10/11km run course.
The course heads up the Cameron River nearly to the source, up and over a saddle into the South Ashburton River then a blast down the river bed over another small saddle and then back across the paddocks to the woolshed.
42km MTB + 10/11km Trail Run/Walk