Mirkwood is any of several great dark forests in novels by Sir Walter Scott and William Morris in the 19th century, and by J. R. R. Tolkien in the 20th century. The critic Tom Shippey explains that the name evoked the excitement of the wildness of Europe's ancient North.
At least two distinct Middle-earth forests are named Mirkwood in Tolkien's legendarium. One is in the First Age, when the highlands of Dorthonion north of Beleriand became known as Mirkwood after falling under Morgoth's control. The more famous Mirkwood was in Wilderland, east of the river Anduin. It had acquired the name Mirkwood after it fell under the evil influence of the Necromancer in his fortress of Dol Guldur; before that it had been known as Greenwood the Great. This Mirkwood features significantly in The Hobbit and in the film The Hobbit: The Desolation of Smaug.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).