You have to love movies about nature-based horror movies. Man has an inherent fear of nature ever since moving into the cities and becoming estranged from the beasts. I always said that a Bigfoot hunting show would be much scarier than a ghost hunting one. In ghost hunting, we tromp around old buildings--atmospheric, but not really scary. The woods, however, when you sit out there at night and hear the twigs cracking and strange sounds you don't recognize in a territory that is not your own, but the creature's domain, well, what can I say but "The Blair Witch Project?"
I've put my favorites in bold.
"The Final Terror"
"Day of the Animals"
"Cabin Fever"
"Just Before Dawn"
"Alive"
Others:
"Deliverance"
"The Edge"
"Wrong Turn"
"The Hills Have Eyes"
"The Descent"
"The Blair Witch Project"
"Wrong Turn"