The Saint Lawrence River is one of the most polluted in the world and these surrounding forests are vulnerable to clearance for agriculture and urban development including the cities of Montreal, Ottawa, Quebec City and suburbs of Toronto, Syracuse and Albany, New York. Less than 5% of natural forest remains intact. The fragmented blocks of remaining habitat include: the eastern end of Lake Ontario; Missisquoi National Wildlife Refuge in Vermont; the Chaumont Barrens, Rome Sand Plains, the Albany Pine Bush and the proposed Split Rock Wildway in New York; Bruce Peninsula (the barrier between Georgian Bay and the main section of Lake Huron), Alfred Bog, Luther Marsh, the Ganaraska Forest and Carden Plain in Ontario; and Mont Saint-Hilaire, Lac Saint-François National Wildlife Area and Cap Tourmente National Wildlife Areas in Quebec.