"Viriconium" is a fictional city created by British author M. John Harrison. It serves as the setting for several of his works, particularly in the collection titled "Viriconium Nights." The city is depicted as a decaying, dreamlike place, blending elements of fantasy and science fiction, where the boundaries of reality are often blurred. The stories set in Viriconium explore themes of memory, identity, and the passage of time. The city itself is characterized by its shifting landscapes and surreal atmosphere, reflecting the inner lives of its inhabitants. Harrison's portrayal of Viriconium has influenced the genre of weird fiction and continues to resonate with readers.