‘Akpatok Island, Canada. One of Canada’s most amazing arctic islands, it is ringed with steep limestone cliffs that rise high above sea level and its central plateau. Unsurprisingly, it is accessible only by air, which is pretty ideal for its cliff nesting seabirds called Akpatoks (or Thick-billed Murres as we know them). Image courtesy of the United States National Oceanic and Atmospheric Adminstration’s Geodesy Collection’