Tsingy National park in Madagascar is protected by a massive natural barrier of razor sharp limestone peaks. They used to be coral millions of years ago, and now are protecting a large are full of unique wildlife. The park is extremely difficult for people to enter, so the wildlife is pretty safe… for now.
This is a Madagascar-endemic rock formation.
Yeah, you read that right.
Not only are 80% of the animals and plants endemic, but the island has it’s own freaking rock-types as well.
Also, it’s actually not true to say the wildlife is safe. Although, yes, the karst does isolate the deep insides quite well, there are channels which can allow you to walk among many of the rocks, and these protected areas are actually being quite heavily deforested. It’s a big problem.