Yes. This is the heartbreaker part of the race. It is about 45kms from the start and you have to run all the way up and back down again. Meanwhile the runners who are doing the 42km version only have to run down this part of the course.
This is a hard hill climb on fresh legs. On legs that have already seen about 2000 metres of climbing, it's a real mission just to walk up it.
I'm hoping that this year I'll actually be able to run at least some of the uphill ;-)