Question: Tennessee–Tombigbee Waterway and Walhonding Canal, are located in which country?
Context: Columbus is a city in and the county seat of Lowndes County, Mississippi, United States, located primarily east, but also north and northeast of the Tombigbee River, which is also referred to as the Tennessee-Tombigbee Waterway .  It is approximately 146 mi northeast of Jackson, 92 mi north of Meridian, 63 mi south of Tupelo, 60 mi northwest of Tuscaloosa, Alabama, and 120 mi west of Birmingham, Alabama.  The population was 25,944 at the 2000 census and 23,640 in 2010.  The population in 2012 was estimated to be 23,452.  Columbus is the principal city of the Columbus Micropolitan Statistical Area, which is part of the larger Columbus-West Point Combined Statistical Area.  Columbus is also part of the area of Mississippi called The Golden Triangle, consisting of Columbus, West Point and Starkville, in the counties of Lowndes, Clay and Oktibbeha. Holcut was a small town located in Tishomingo County, Mississippi, United States.  In 1976, the U.S. Army Corps of Engineers bought out and then completely demolished the town because it lay directly in the path of the Divide Cut, a 29 mi artificial canal section of the Tennessee–Tombigbee Waterway, which was constructed between 1972 and 1984. The John C. Stennis Lock and Dam, formerly named Columbus Lock and Dam, is one of four lock and dam structures on the Tennessee-Tombigbee Waterway that generally lie along the original course of the Tombigbee River.  It is located near Columbus, Mississippi, and impounds Columbus Lake.  It is named for longtime U.S. Senator from Mississippi, John C. Stennis. The Tom Bevill Lock and Dam, formerly named Aliceville Lock and Dam, is one of four lock and dam structures on the Tennessee-Tombigbee Waterway that generally lie along the original course of the Tombigbee River.  It is located near Aliceville, Alabama and impounds Aliceville Lake.  It is named for Tom Bevill, a proponent of the Tenn-Tom. The Walhonding Canal was a canal in Coshocton County, Ohio that was used as a feeder canal for the Ohio and Erie Canal.  A small canal, at only 25 mi long, it was wholly contained within Coshocton County, following the Mohican River from Cavallo south to the confluence with the Kokosing River, which together with the Mohican forms the Walhonding River.  The canal followed the Walhonding River southeast toward Coshocton where it met the Ohio and Erie Canal in Roscoe Village. The Tennessee–Tombigbee Waterway (popularly known as the Tenn-Tom) is a 234-mile (377-kilometer) man-made waterway that extends from the Tennessee River to the junction of the Black Warrior-Tombigbee River system near Demopolis, Alabama, United States.  The Tennessee–Tombigbee Waterway links commercial navigation from the nation’s midsection to the Gulf of Mexico.  The major features of the waterway are 10 locks and dams, a 175 ft deep cut between the Tombigbee River watershed and the Tennessee River watershed, and 234 mi of navigation channels. The Howell Heflin Lock and Dam, formerly Gainesville Lock and Dam, is one of four lock and dam structures on the Tennessee-Tombigbee Waterway that generally lie along the original course of the Tombigbee River.  It is located near Gainesville, Alabama, and impounds Gainesville Lake.  It is named for Howell Heflin, a former United States Senator from Alabama. The Aberdeen Lock and Dam is one of four lock and dam structures on the Tennessee-Tombigbee Waterway that generally lie along the original course of the Tombigbee River.  It is located east of Aberdeen in Monroe County, Mississippi and impounds Aberdeen Lake. The Mobile River is located in southern Alabama in the United States.  Formed out of the confluence of the Tombigbee and Alabama rivers, the approximately 45 mi river drains an area of 44000 sqmi of Alabama, with a watershed extending into Mississippi, Georgia, and Tennessee.  Its drainage basin is the fourth-largest of primary stream drainage basins entirely in the United States.  The river has historically provided the principal navigational access for Alabama.  Since construction of the Tennessee-Tombigbee Waterway, it also provides an alternative route into the Ohio River watershed. The Tombigbee River is a tributary of the Mobile River, approximately 200 mi (325 km) long, in the U.S. states of Mississippi and Alabama.  Together with the Alabama, it merges to form the short Mobile River before the latter empties into Mobile Bay on the Gulf of Mexico.  The Tombigbee watershed encompasses much of the rural coastal plain of western Alabama and northeastern Mississippi, flowing generally southward.  The river provides one of the principal routes of commercial navigation in the southern United States, as it is navigable along much of its length through locks and connected in its upper reaches to the Tennessee River via the Tennessee-Tombigbee Waterway.
Answer: United States