The word 'Moss' in a placename usually indicates marshy, boggy ground. Many such areas will have long since been drained, but it's interesting to note that they would once have been those liminal places where the land was not quite land, and not quite water - so possibly an attractive habitat for those things that were not quite living, and not quite entirely dead. At least in our imaginations.
Drained wetland seems to be prone to a very specific kind of mistiness, as well as the potential for bone numbing coldness. (I think I've mentioned elsewhere that Hackney Marshes at 06.00 on a winter's morning is about the coldest I've ever felt in my life - despite the fact that I've been to, and in fact lived in, places where the mean temperature is - technically - much lower than East London.)