Sixty runners started the marathon this year on Oct 23. An account of the journey can be read over at The Guardian.

The lack of snow cover made the going tougher, as the bare ice offered little grip, even with spikes
A competitor struggles to stay upright on the ice
Nick Mead (right) and Paolo Barghini of Italy (who came second in 3:20:15) tackle an uphill section

Dutch twins Catherina Eva (left) and Maria Schilder finished second and third in the women's full marathon - both in 4:13:41

The rest of the undulating route (the track to the left of the lake) seen from the top of Sugar Loaf mountain
After the ice-cap, the marathon route passes the edge of the Russell Glacier
A competitor gets close up to the glacier during a stop-off on the pre-race route inspection
Recent ice fall at the Russell glacier
Although the Polar Circle marathon involves a net height loss of around 500m, there are still a lot of hills to climb (around 500m up and 1,000m down)
The final few miles of the route (track on the right) into Kangerlussuaq - home of Greenland's main airport and base for the Polar Circle marathon
Winners Maja Boe (3:52:59) and Jesper Rygaard Hansen (3:17:35), both from Denmark