English: The open waters of Lake Huron as seen in July 2015 from aboard the Tobermory Frontier at Fathom Five National Marine Park in Ontario, Canada. Fathom Five was established by Parks Canada in 1987 as the first of what are now four National Marine Conservation Areas of Canada. This 44-square-mile expanse of Lake Huron serves to protect not only a delicate marine ecosystem that includes several rare species of orchid and fern, but also a unique landscape of dolomite rock eroded into sea stacks popularly known as "flowerpots", as well as an array of nearly two dozen shipwrecks that make the park one of the world's topmost attractions for freshwater divers.