Thousand Islands level year-round, and support at least two living trees. The Thousand Islands archipelago is located at the outlet of Lake Ontario at the head of the Saint Lawrence River. The region is bisected by the Canada–United States border and covers portions of Jefferson and St. Lawrence counties in the U.S. state of New York, in addition to parts of the United Counties of Leeds and Grenville and Frontenac County in the Canadian province of Ontario. Geologically, most of the islands are located where a branch of the Canadian Shield runs south across the river to join with the Adirondacks. The
North American river otter analyzed. However, many other studies did not report any findings of North American beaver remains in the scat sampled. The North American river otter has few natural predators when in water. Aquatic predators include the American alligator ("Alligator mississippiensis"), American crocodile ("Crocodylus acutus"), and killer whale ("Orcinus orca"), none of which commonly coexist with the North American river otter and thus rarely pose a threat. On land or ice, the North American river otter is considerably more vulnerable. Terrestrial predators include the bobcat ("Lynx rufus"), mountain lion ("Felis concolor"), coyote ("Canis latrans"), domestic dog ("Canis lupus familiaris"), wolf ("Canis lupus"),