The Willows is a novella by Algernon Blackwood, first published in 1907. It is often considered one of Blackwood's greatest works and a classic of supernatural fiction. The story is renowned for its atmospheric tension and exploration of the unknown.

Two friends, the unnamed narrator and his companion known as "The Swede," embark on a canoe trip down the Danube River. They venture into a remote and desolate region filled with dense willows, far from civilization. The landscape is eerie and otherworldly, with the river seeming to possess a life of its own.

As they set up camp on a small island surrounded by willows, they begin to experience strange and unsettling phenomena. The willows seem to move and whisper, creating an overwhelming sense of unease. The natural environment appears hostile and alive, contributing to the growing tension.

The protagonists soon realize they are not alone. They sense the presence of malevolent, unseen entities that inhabit the area. These forces are beyond human understanding and defy logical explanation. The isolation, coupled with the oppressive atmosphere, drives the men to the brink of madness.

Throughout the story, Blackwood masterfully builds a sense of dread through his vivid descriptions of the landscape and the psychological effects on the characters. The story's power lies in its ability to evoke the unknown and the inexplicable, leaving readers with a lingering sense of fear and wonder.