<P> North Dakota is about 340 miles (545 km) east to west and 211 miles (340 km) north to south, with a total area of 70,704 square miles (183,123 km2), making it the 19th largest of the 50 U.S. states . About 2.4% of North Dakota's area is covered by water . </P> <P> The Red River Valley takes up the eastern portion of the state, with the Red River of the North forming the border with Minnesota . </P> <P> The Valley is the remnant lake bed of the ancient Lake Agassiz . It is very flat, and is quite fertile . This area of North Dakota is mostly farm country, with wheat, sugarbeets, and maize as staple crops, and along with other crops and livestock, cover the area . The valley contains the lowest point in North Dakota which is the Red River at Pembina, at 750 feet (230 m) above sea level . </P> <P> To the west of the Red River Valley is the Drift Prairie and the Missouri Plateau (or Coteau du Missouri). The Drift Prairie is bordered on the north by the Turtle Mountains and separated from the Red River Valley by the Pembina Hills . This area rises from 200 to 2,000 feet over the Red River Valley . The Drift Prairie is covered in lakes, stream valleys, and rolling hills . This region suffers moderate to severe flooding from the Red River almost annually, caused by the heavy snowfall in this region every winter . </P>

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