I thought I would try something a bit different. Here's a cavern complex that was once an ancient tomb but has since become home for various other species. The light areas in cavern 1 and cavern 10 are hidden entrances to the cave complex. They are either hidden by brush, trees, large rocks, etc. The large circular light area at cavern 5 a represents a spot that had caved in and left a large hole in the ground. An alternate idea is the map could be a series of flooded caves. The lighter areas would be open to the surface. It could be a good underwater base of some kind.
caverns-019.jpg