H21A winner ran 6:30 min/km. So there is more nasty terrains out there. But like Jape Käyhkö (VeVe) commented after the race, he couldn't remember last time he ran in a nastier terrain.
They should have waited about 10 years. The are is covered with young young forest, it should get better and better from now on. But it's located by the Kausala village and they liked to get it mapped for their weekly b level training events.
Quite funny: the fact is this Iitti area is full of very nice areas for orienteering, most of them still unmapped. And this is maybe the worst they have. Just pan few kilometer NW /N from the event site:
http://kansalaisen.karttapaikka.fi/linkki?text=200...
For example this one is pretty cool:
http://www.routegadget.net/rh/cgi-bin/reitti.cgi?a...