Geography of the United States York City, and includes the Florida peninsula. Areas further inland feature rolling hills, mountains, and a diverse collection of temperate and subtropical moist and wet forests. The Appalachian Mountains form a line of low mountains separating the eastern seaboard from the Great Lakes and the Mississippi Basin. The five Great Lakes are located in the north-central portion of the country, four of them forming part of the border with Canada, only Lake Michigan situated entirely within United States. The southeast United States, generally stretching from the Ohio River on south, includes a variety of warm temperate and subtropical moist and
The Great Lakes Group provides linehandling assistance to vessels transiting the United States Army Corps of Engineers-administered and -operated Soo Locks at Sault Ste. Marie, Michigan on the St. Mary's River, the only water connection between Lake Superior and the other Great Lakes. The Soo Locks are located in the St. Mary's Rapids, where the water falls about 21 feet from the level of Lake Superior to the level of the lower lakes. Vessels must transit the Soo Locks en route to the principal ports of Duluth, Minnesota and Thunder Bay, Ontario and outbound to the sea. In 1999 Admiral Towing and Barge Company