The Willows :

The Willows by Algernon Blackwood is a haunting masterpiece of early supernatural fiction, blending psychological horror with the eerie majesty of nature. Set along the remote banks of the Danube River, the novella follows two travelers whose peaceful canoe journey turns into a terrifying encounter with unseen forces lurking in the marshlands. As the willows seem to shift and whisper with unnatural intent, the boundary between reality and another dimension begins to dissolve. Atmospheric, suspenseful, and deeply unsettling, this story is a foundational work of weird fiction that profoundly influenced authors like H.P. Lovecraft.