Those "general groups" things; parasite groups. Also grass groups.
Oh! Also, when it comes to the rivers, if this is not already in place, I suggest making them "river systems" ( http://en.wikipedia.org/wiki/Mississippi_River_System
) so as to allow for very massive main rivers alongside many smaller rivers and water ways.
It would allow for more realism I suppose.
Also, is the wiki safely housed/hosted again?