Innsmouth is a fictional coastal town created by author H.P. Lovecraft. It is known for its eerie atmosphere and the presence of strange, aquatic creatures called the Deep Ones. The town is characterized by its decaying buildings and a history of dark secrets, making it a central location in Lovecraft's horror stories. The most famous story set in Innsmouth is "The Shadow over Innsmouth," where a narrator uncovers the town's unsettling connections to the Deep Ones and their worship of the ancient sea deity, Dagon. This tale highlights themes of isolation, degeneration, and the fear of the unknown, which are prevalent in Lovecraft's works.