Niue is mostly surrounded by coral reef, with an interesting mix of cavern, caves, pristine coral walls and drop-off to explore. As Niue is made of porous limestone, it has no lake or streams. This means that rain can quickly filter through the porous coral into the sea below, there is no sediment in the water and visibility can be up to 80 meters, definitely the best in the world. Besides that, Niue is also home for an incredible rich array of marine life, some are even endemic species. If tourists would love to find some private beaches or swimming cave, Niue has lots of these on offer for them to discover. Some of the hidden chasms were formerly reserved exclusively for ancient Niuean Kings, where come with a rich history.