Bewilderland 

The introduction includes the comment:-
"The story is told in the form of an episodic quest, and most chapters introduce a specific creature, or type of creature, of Tolkien's Wilderland".

I edited the last bit to Middle-earth because:-
(1) the introduction to creatures begins with Chapter 1, which introduces Hobbits (and Wizards and Dwarves), and continues with chapter 2 (which introduces Trolls) and chapter 3 (which introduces Elves). These creatures are not limited to "Tolkien's Wilderland", and in fact the individuals introduced (Bilbo, Gandalf, Thorin & Co., etc.) do NOT live in Wilderland. Wilderland is properly the region east of the Misty Mountains, and Bilbo does not reach it until chapter 6.
(2) Furthermore, many of the creatures first encountered in Wilderland (e.g. Men and Dragons) are not unique to Wilderland in Tolkien's Middle-earth.
(3) I'm aware that Middle-earth in not named in the book. However most readers of Wikipedia would have heard of Middle-earth, and few would have heard of Wilderland.  
(4) In any case a link is required.

But I guess whoever reversed my edit knows better. Regards, 203.26.122.8