Or rather, in the province of Friesland. This skating marathon is held not very often. Conditions have to be that there be at least 15 cm of ice to skate on, or in you money, about 6 inches. As it turns out, right now we have a rather cold spell here at the moment. Two nights in a row the thermometer reached at least 20 below zero Celsius.
If this marathon will get the go-ahead you'll see this on CNN, cause for one day the whole of the Netherlands will go mad in one day. Two million spectators are expected!
This link will show you the ice thickness along the route. Zoom in on the north western part of that map and you'll see the red line of the route. Total distance is over 200km. I'll tell you more later. More news will follow.

Here's a wikipedia page about it.
http://en.wikipedia.org/wiki/Elfstedentocht