Near the northwestern coast, this 257-square-mile spread is a UNESCO World Heritage Site thanks to its mangrove forests and wildlife including birds and lemurs - but perhaps most of all because of its singular topography, with a "forest" of sheer, sharp, and pointy limestone karst pinnacles that make for an impressive sight indeed. Visitors have a choice of four circuits, ranging from walkways to - for the more adventurous/in shape - via ferratas (climbing routes using steel cables, rungs, and ladders).

 Moq