Grand Tower Island is a river island in the Mississippi River in the midwestern United States, within the state of Missouri on its border with the state of Illinois. Formed within recorded history by the movement of the river, it consists of a bulge-shaped piece of land between the river's primary channel and an oxbow lake. Land on the island is generally valuable for farming, especially when protected from flooding, while the lake has developed a reputation as a valuable sport-fishing location.GeographyGrand Tower Island lies on the left bank of the Mississippi River in a remote area between St. Louis, Missouri and Cairo, Illinois. It shares its name with the adjacent small city of Grand Tower, Illinois, as well as with the landmark Tower Rock island on the Missouri side of the river. Despite its location on the eastern side of the river and its road connections to Illinois, the island is part of Brazeau Township, Perry County, Missouri, in a situation analogous to the right-bank river village of Kaskaskia, Illinois. A towhead (a narrow island much longer than its width) approximately long lies in the river between Grand Tower Island and the Missouri mainland.
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