In the canyon is a small cave hidden behind a breakable rock. Just after entering the cave, survivors can find a rotted corpse of a human male. Arrows stuck into the ground suggest he was running inside the cave while being fired upon. In the next room are large Crystal nodes and a sleeping bag.
Crystal Cave
If you follow the leftmost river up, you will go find a small cave that is slightly smaller than a Gallimimus, this cave has many Crystals and also provides an insulation bonus.
Waterfall Cave
The Waterfall Cave is an incredibly large Cave that also contains a small pond on the right side, though this location is bugged and only one small corner of the Cave provides insulation.