"The Willows" is a supernatural horror novel written by Algernon Blackwood, first published in 1907. The story follows two friends, Mark and Ernest, who embark on a canoe trip along the Danube River. They camp on a remote island, where they encounter strange and unsettling phenomena that challenge their understanding of reality. As the narrative unfolds, the characters experience a growing sense of dread and isolation, influenced by the eerie natural surroundings. The novel explores themes of nature's power and the unknown, making it a significant work in the genre of weird fiction and a precursor to later horror literature.