Red rock is on the far north west side of the city, there is an area popular for folks who like to take their trucks off roading. I have been up there a few times. The area is very rocky and mountainous. The mudding trails are pretty well used but there is a lot of open cattle range areas and places too treacherous to hike or take a vehicle. It would probably be very easy to hide a child's body there unfortunately. There are houses up there too but I assume the area a body would be found is up on or near the mountain.