Mirkwood Forest is a vast and dark woodland located in Middle-earth, a fictional world created by J.R.R. Tolkien. It is known for its dense trees, thick underbrush, and a sense of foreboding. The forest is home to various creatures, including giant spiders and other mystical beings, making it a place of both beauty and danger. Originally known as Greenwood the Great, Mirkwood became dark and sinister due to the influence of the Necromancer, later revealed to be Sauron. The forest plays a significant role in The Hobbit, where Bilbo Baggins and the Dwarves face numerous challenges while traveling through its depths.