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The Ohio River at Cairo is 281,500 cu ft/s (7,960 m 3 /s); [2] and the Mississippi River at Thebes, Illinois, which is upstream of the confluence, is 208,200 cu ft/s (5,897 m 3 /s). [66] The Ohio River flow is greater than that of the Mississippi River, so hydrologically the Ohio River is the main stream of the river system.
Map of the Tennessee Watershed. The Tennessee Valley Divide is the boundary of the drainage basin of the Tennessee River and its tributaries.. The Tennessee River drainage basin begins with its tributaries in southwestern Virginia and flows generally west to the confluence of the Tennessee with the Ohio River at Paducah, Kentucky.
The Tennessee River begins at mile post 652, where the French Broad River meets the Holston River, but historically there were several different definitions of its starting point. In the late 18th century, the mouth of the Little Tennessee River (at Lenoir City) was considered to be the beginning of the Tennessee River.
Kentucky that the state line is the low-water mark of the Ohio River's north shore as of Kentucky's admission to the Union in 1792. [2] Because both damming and natural changes have rendered the 1792 shore virtually undetectable in many places, the exact boundary was decided in the 1990s in settlements among the states.
The Upper Tennessee Valley, looking east from the edge of the Cumberland Plateau near Rockwood, Tennessee. The Tennessee Valley begins in the upper head water portions of the Holston River, the Watauga River, and the Doe River in Northeast Tennessee and Southwest Virginia, as well as east of Asheville, North Carolina, with the headwaters of the French Broad and Pigeon rivers, all of which join ...
Most of the state is considered part of the Upland South, and the eastern third is part of Appalachia. [ 1 ] Tennessee covers roughly 42,143 square miles (109,150 km 2), of which 926 square miles (2,400 km 2), or 2.2%, is water. It is the 16th smallest state in terms of land area. The state is about 440 miles (710 km) long from east to west and ...
The Big Sandy River, called Sandy Creek as early as 1756, is a tributary of the Ohio River, approximately 29 miles (47 km) long, [7] in western West Virginia and northeastern Kentucky in the United States. The river forms part of the boundary between the two states along its entire course. Via the Ohio River, it is part of the Mississippi River ...
Each subregion includes the area drained by a river system, a reach of a river and its tributaries in that reach, a closed basin or basins, or a group of streams forming a coastal drainage area. [6] Regions receive a two-digit code. The following levels are designated by the addition of another two digits. [7]