Expanding South Nahanni National Park, Northwest Territories, Canada, to Include and Manage Some Remarkable Sub-Arctic/Arctic Karst Terranes

South Nahanni National Park Reserve (Lat. 61°N, Long. 124–8°W; ∼4,700 km2) was created in 1972 to protect three great canyons and a major waterfall from hydroelectric development. In 1978, it was one of the first natural sites to be granted UNESCO “World Heritage” status, based substantially on the author’s geomorphic analyses. In the course of that work, extensive tracts of limestone karst landforms, some of them unique, were explored up to 40 …