Algernon Blackwood’s “the Willows” comes immediately to mind. It’s about two men traveling by river and forced to camp on an island. The wilderness surrounding them is depicted as supernatural and malevolent. This one is public domain I believe.
T Kingfisher wrote a book called “the hollow places” that took inspiration from the willows and modernized it. I found this one enjoyable enough, but rather slight. Ymmv.
Adam Neville’s “the ritual” takes place in a forest. Or so I believe - I haven’t read it, but I love the movie adaptation. As I understand it though the movie took liberties with the source material and differed in key respects.