As somebody who likes nature, please don't make fire on a cliff. It leads to the rock cracking and degrading faster. The next one coming along wants to enjoy the place as much as you do.
Thanks for the tip, honestly didn't know that. It's actually a sandstone cliff, my fire is about 15m from the edge (nearer my tent than the drop) and I'm using my own firepit. It's generally pretty hard to light fires (legally) in this part of the world without some serious precautions!
