Aug 31, 2006 — One of the biggest threats to the Great Lakes system is the loss of thousands of square miles of wetlands. From Lake Superior to the St. Lawrence River, some of the most important wildlife habitat along the edge of the waterway has been lost. For example, 200 years ago, much of the southern shore of Lake Erie was a huge swamp. Almost all of it has been drained and filled since European settlement. The GLRC's Julie Grant went to visit the last remaining bit, and the people who preserve it.