@snowleopard It is 700 square meters, which is the same size as some new enclosures for tiger and lion are as well. Though marten are relatively small, people tend to forget that they are incredibly active (or asleep, but nothing in between) and this is the only marten enclosure I have seen that actually shows how active and curious these animals can be, as here they can use their energy.
I have sat at this viewing window during an hour at my visit and it was an hour very well spent
