The Great Dismal Swamp National Wildlife Refuge was created in 1974 to help protect and preserve a portion of the Great Dismal Swamp, a marshy region on the Coastal Plain of southeastern Virginia and northeastern North Carolina between Norfolk, Virginia, and Elizabeth City, North Carolina in the United States.
 It is located in parts of the independent cities of Chesapeake and Suffolk in Virginia, and the counties of Camden, Gates, and Pasquotank in North Carolina.
The Dismal Swamp Canal is located along the eastern edge of the Great Dismal Swamp in Virginia and North Carolina in the United States.
 It is the oldest continually operating man-made canal in the United States, opened in 1805, and closed in October 2016.
 It is part of the Intracoastal Waterway, an inland route, which parallels the east coast and offers boaters shelter from the Atlantic Ocean from Manasquan Inlet, New Jersey, to Brownsville, Texas.
 The route runs through bays, lakes, rivers, streams, and canals, and includes the Intracoastal Waterway running from Norfolk, Virginia, to the Florida Keys.
The Madera Canal is a 35.9 mi aqueduct in the U.S. state of California.
 It is part of the Central Valley Project managed by the United States Bureau of Reclamation to convey water north to augment irrigation capacity in Madera County, California.
 It was also the subject of the United States Supreme Court's decision in Central Green Co. v. United States.
The Nansemond National Wildlife Refuge is a National Wildlife Refuge of the United States located along the Nansemond River in Suffolk, Virginia.
 It is managed by the United States Fish and Wildlife Service as a satellite of Great Dismal Swamp National Wildlife Refuge.
 In 1973 about 207 acre of salt marsh were transferred to the Service by the United States Navy to form the refuge.
 An additional 204 acre were transferred in 1999.
Lake Drummond is a freshwater lake at the center of the Great Dismal Swamp, a marshy region on the Coastal Plain of southeastern Virginia and northeastern North Carolina between Norfolk, Virginia, and Elizabeth City, North Carolina, in the United States.
 Surface area of the lake is approximately 3142 acre and the maximum depth is 6 ft .
 Management of the lake is the responsibility of the United States Fish and Wildlife Service.
Wallaceton is a historic home located at Chesapeake, Virginia.
 The original section was built between 1853 and 1863, as a company store.
 It was expanded after the American Civil War.
 It is a 1 1/2-story, rectangular, Greek Revival style frame dwelling.
 It has flat corner pilasters, a heavy box cornice under the eaves, and a full width front porch.
 Also on the property are a contributing two-room kitchen building and a dairy.
 About 1910, it was relocated approximately 100 feet to the east of the Dismal Swamp Canal to remove it from canal property.
 It was named for John Gallaudet Wallace (1840-1910) a farmer and businessman who fought in the Civil War for the Confederacy, as a Captain of Company C, 61st Virginia Volunteer Infantry Regiment.
Moses Grandy (  1786 - unknown), was an African-American author, abolitionist, and, for more than the first four decades of his life, an enslaved person.
 At eight years of age he became the property of his playmate, James Grandy and two years later he was hired out for work.
 The monies Moses earned were collected and held until James Grandy turned 21.
 Grandy helped build the Great Dismal Swamp Canal and learned how to navigate boats.
 It was that skill that led him to be made commander of several boats that traveled the canal and Pasquotank River, transporting merchandise from Elizabeth City, North Carolina to Norfolk, Virginia.
 The position allowed him to be better fed, shod and dressed.
 Able to keep a portion of his earnings, Grandy arranged to buy his freedom twice and twice his owners kept the money and held him in slavery.
 An arrangement was made for an honorable man to buy him and Grandy earned the money to buy his freedom a third time, this time successfully.
Dismal Swamp State Park is a North Carolina state park in Camden County, North Carolina in the United States.
 The park was created as a state natural area in 1974 with the help of The Nature Conservancy, and on July 28, 2007 the NC General Assembly re-designated it as a state park.
 It opened to the public in 2008.
 This marked the first time that public access to Great Dismal Swamp was made possible in North Carolina.
 The park covers 14432 acre of protected land on the North Carolina/Virginia border.
 Park offices are three miles (5 km) south of the border on U.S. Route 17 near South Mills.
 Features of the park include the canal which is used regularly by boaters using the Intracoastal Waterway and several miles of hiking and biking trails.
The Delta–Mendota Canal is a 117 mi aqueduct in central California, United States.
 It is part of the Central Valley Project and its purpose is to replace water in the San Joaquin River that is diverted into Madera Canal and Friant-Kern Canal at Friant Dam.
 Average annual throughput is 1993000 acre feet .
The Pungo River is a river in eastern North Carolina, United States.
 It originally began in the Great Dismal Swamp in Washington County, North Carolina; the upper part of the river has since been supplanted by the Pungo River Canal, dug in the 1950s to improve drainage of local farmland.
 The river flows southeast and forms part of the boundary between Beaufort County and Hyde County.
 The river then widens dramatically, turns west, and flows past Belhaven, North Carolina before joining the Pamlico River near Pamlico Sound.

Question: Are the Madera Canal and the Dismal Swamp Canal both on the western half of the United States?
Answer: no