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71 Interior Plateau (far southern Illinois) 71a - Crawford-Mammoth Cave Uplands; 71m - Northern Shawnee Hills; 71n - Southern Shawnee Hills; 72 Interior River Valleys and Hills (along the State boundary rivers and into the interior along the Illinois River, also the broad somewhat hillier southern and western till plains) 72a - Wabash-Ohio ...
The Illinois side includes Henry County, Mercer County, and Rock Island County. [4] In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level.
The Shawnee Hills are a region within the larger Interior Low Plateaus physiographic province located in southern Illinois, southern Indiana, and western Kentucky. [1] In Illinois it rests mainly in an east–west arc roughly following the outline of the southern end of the Illinois Basin .
The country's core region is the central Congo Basin. [1] Having an average elevation of about 44 metres (144 ft), it measures roughly 800,000 square kilometres (310,000 sq mi), constituting about a third of the DRC's territory. [1] Much of the forest within the basin is swamp, and still more of it consists of a mixture of marshes and firm land ...
A landlocked country is a country that does not have any territory connected to an ocean or whose coastlines lie solely on endorheic basins.Currently, there are 44 landlocked countries, two of them doubly landlocked (Liechtenstein and Uzbekistan), and three landlocked de facto states in the world.
The steep riverine landscape of both the Driftless Area proper and the surrounding Driftless-like region is the result of early glacial advances that forced preglacial rivers that flowed into the Great Lakes southward, causing them to carve a gorge across bedrock cuestas, [1] thereby forming the modern incised upper Mississippi River valley.
Southern Illinois is a region of the U.S. state of Illinois comprising the southern third of the state, principally south of Interstate 70.Part of downstate Illinois, it is bordered by the two most voluminous rivers in the United States: the Mississippi below its connection with the Missouri River to the west and the Ohio River to the east and south, with the tributary Wabash River, extending ...
Paleogeographic reconstruction showing the Illinois Basin area during the Middle Devonian period. [9] Almost all Silurian rocks in Illinois are deep-water limestone and dolomite deposits; reef habitats were common, and fossils of reef organisms are locally highly abundant, including corals, brachiopods, crinoids, stromatoporoids, and bryozoans. [6]