Lost in the Wilderness

I know that we sort of touched on this subject Tuesday in class, but I thought maybe the blog would be a good place to get some responses.  I was really wondering what the significance of the jungle and its personification in the Heart of Darkness is.  It may mean nothing, but it does seem to be one of the big motifs and seeing as this book is full of hidden meanings it may be helpful to figure out as much as is possible.