Nelson-Tasman features many unique aspects. Nowhere else in the world can three very distinctive national parks be found in such a relatively small area, offering glistening waters, golden sands, spectacular native forests, lakes and mountain ranges, all of which are easily accessible year-round. Nelson-Tasman’s coast is notable for two huge, shallow bays - Tasman Bay and Golden Bay. The interior of the region is hilly and mountainous with attractive lakes and areas of limestone and marble which feature deep caves and sinkholes. Te Waikoropupu springs, said to produce the clearest fresh water in the world, is part of the southern hemisphere’s deepest known cave system.