Books set in the mountains 🏔️

Hello everyone, hope you have a wonderful day!
Could you recommend me some books set in the forest or mountains? It would be great if the main character travels on their own. I love solo hiking, but right now I can’t do this, unfortunately. I miss that atmosphere of being alone in nature though and want to experience it once more by reading a novel. Must note that I don’t really like fantasy.
I’d be glad to receive any recommendations, thanks in advance! 🧚