Thousand Islands – Frontenac Arch is one of four ecoregions of the Mixedwood Plains. The Thousand Islands in the Saint Lawrence River have a distinctive flora and fauna and are a part of the biological corridor. The bedrock is mostly gneiss, granite and marble, more than a billion years old. The Frontenac terrain is the youngest of the Ontario portions of the arch, dated at 1.2 billion years old. These rocks were once part of a large mountain chain of the ancient supercontinent of Rodinia. There is also a meteor crater near Holleford, where the shield meets the limestone plains of southeastern Ontario. The area
Thousand Islands (Cocoa Beach) 2006 with acquisition of the Reynolds tract, and were completed in 2007 with acquisition of the Crawford Homes tract by the Brevard County Environmentally Endangered Lands Program (EEL). Restoration efforts involve removal of Brazilian pepper and Australian pine. Despite the Category I status of Australian pine, removal of trees in ecological restoration can be controversial among the lay public. In the EEL-managed Thousand Islands Conservation Area, replanting has been used following removal of Australian pine, but the effects are modest, with native recruitment out-pacing planted species. The management plan for the north Thousand Islands is currently (April 2013) under revision.