Inside bizarre amalgamations of existing creatures roam around ready to kill predator and prey indiscriminately.
We mention that it becomes more and more abstract as one walks into it, eventually leading to the same place Apocalypse Land does (and there are probably other entrances to the Nether, which is what it is dissolving into.
We have a concept art section at the end of this article, like most of the encyclopedia articles. https://i.imgur.com/MckRuK8.jpg https://imgur.com/tKNQjAn
Maybe we mention the Deadwood has been around a long time, but was mostly seen as a curiosity. Rosewater probably started around the same time as the Deadwood.