Wabash River in the context of "Illinois"

The Mississippi River System, also referred to as the Western Rivers, is a mostly riverine network of the United States which includes the Mississippi River and connecting waterways. The Mississippi River is the largest drainage basin in the United States. In the United States, the Mississippi drains about 41% of the country's rivers.

From the perspective of natural geography and hydrology, the system consists of the Mississippi River itself and its numerous natural tributaries and distributaries. The major tributaries are the Arkansas, Illinois, Missouri, Ohio and Red rivers. Given their flow volumes, major Ohio River tributaries like the Allegheny, Tennessee, and Wabash rivers are considered important tributaries to the Mississippi system. Before the Mississippi River reaches the Gulf of Mexico, it runs into its distributary, the Atchafalaya River.

Stream capture, river capture, river piracy or stream piracy is a geomorphological phenomenon occurring when a stream or river drainage system or watershed is diverted from its own bed, and flows down to the bed of a neighbouring stream. This can happen for several reasons, including:

• Tectonic earth movements, where the slope of the land changes, and the stream is tipped out of its former course
• Natural damming, such as by a landslide or ice sheet
• Erosion, either
  • Headward erosion of one stream valley upwards into another, or
  • Lateral erosion of a meander through the higher ground dividing the adjacent streams.
  • Within an area of karst topography, where streams may sink, or flow underground (a sinking or losing stream) and then reappear in a nearby stream valley
• Glacier retreat

The Illinois Country (French: Pays des Illinois [pɛ.i dez‿i.li.nwa]; lit. 'land of the Illinois people'; Spanish: País de los ilinueses), also referred to as Upper Louisiana (French: Haute-Louisiane [ot.lwi.zjan]; Spanish: Alta Luisiana), was a vast region of New France claimed in the 1600s that later fell under Spanish and British control before becoming what is now part of the Midwestern United States. While the area claimed included the entire Upper Mississippi River watershed, French colonial settlement was concentrated along the Mississippi and Illinois Rivers in what is now the U.S. states of Illinois and Missouri, with outposts on the Wabash River in Indiana. Explored in 1673 from Green Bay to the Arkansas River by the Canadien expedition of Louis Jolliet and Jacques Marquette, the area was claimed by France. It was settled primarily from the Pays d'en Haut in the context of the fur trade, and in the establishment of missions from Canada by French Catholic religious orders. Over time, the fur trade took some French to the far reaches of the Rocky Mountains, especially along the branches of the broad Missouri River valley. The "Illinois" in the territory's name is a reference to the Illinois Confederation, a group of related Algonquian native peoples.

The Illinois Country was governed from the French province of Canada until 1717 when, by order of King Louis XV, it was annexed to the French province of Louisiana, becoming known as "Upper Louisiana". By the mid-18th century, major settlements included Cahokia, Kaskaskia, Chartres, Saint Philippe, and Prairie du Rocher, all on the east side of the Mississippi in present-day Illinois; and Ste. Genevieve across the river in what is now Missouri, as well as Fort Vincennes in what is now Indiana.

Indiana (/ˌɪndiˈænə/ IN-dee-AN-ə) is a state in the Midwestern region of the United States. It borders Lake Michigan to the northwest, Michigan to the north and northeast, Ohio to the east, the Ohio River and Kentucky to the south and southeast, and the Wabash River and Illinois to the west. Nicknamed "the Hoosier State", Indiana is the 38th-largest by area and the 17th-most populous of the 50 states. Its capital and largest city is Indianapolis. Indiana was admitted to the Union as the 19th state on December 11, 1816.

Indigenous resistance to American settlement was broken with their defeat in Battle of Tippecanoe in 1811, and the collapse of Tecumseh's confederacy in 1813. The new settlers were primarily Americans of British ancestry from the eastern seaboard and the Upland South, and Germans. After the Civil War, in which the state fought for the Union, natural gas attracted heavy industry and new European immigrants to its northern counties. In the first half of the 20th century, northern and central sections experienced a boom in goods manufacture and automobile production. Southern Indiana remained largely rural. After the rise and fall of the Klan in the 1920s, the state swung politically from the Republican to Democratic Party in the New Deal 1930s. Today, with a decades-long record of returning Republican majorities, Indiana is counted a "red state".

During the 18th and early 19th centuries, the French, British and U.S. forces built and occupied a number of forts at Vincennes, Indiana. These outposts commanded a strategic position on the Wabash River. The names of the installations were changed by the various ruling parties, and the forts were considered strategic in the French and Indian War, the American Revolutionary War, the Northwest Indian War and the War of 1812. The last fort was abandoned in 1816.

The settlement around the forts was best known as the territorial capital of the Northwest Territory (later, the Indiana Territory). The best known event was Gen. William Henry Harrison's mustering of forces at Vincennes just prior to his campaign against the Indian capital at Prophetstown in Tippecanoe, culminating in the Battle of Tippecanoe in 1811. This battle was one of the factors that contributed to the start of the War of 1812.

The Tippecanoe River (/ˌtɪpəkəˈnuː/ TIP-ə-kə-NOO) is a gentle, 182-mile-long (293 km) river in the Central Corn Belt Plains ecoregion in northern Indiana. It flows from Crooked Lake in Noble County to the Wabash River near what is now Battle Ground, about 12 miles (19 km) northeast of Lafayette. The name "Tippecanoe" was derived from a Miami–Illinois word for buffalo fish, reconstructed as */kiteepihkwana/ or as kiteepihkwana siipiiwi.

The Tippecanoe River is fed by 88 natural lakes and has a drainage area of 1,250,000 acres (5,100 km), spanning 14 counties. It supports more numerous imperiled species and overall species diversity than most streams of the upper Midwest. The Nature Conservancy has identified it as one of the top ten rivers in the United States to preserve due to its ecological diversity and the high proportion of endangered species found in it.

The White River is an American two-forked river that flows through central and southern Indiana and is the main tributary to the Wabash River. Via the west fork, considered to be the main stem of the river by the U.S. Board on Geographic Names, the White River is 362 miles (583 km) long. Indiana's capital, Indianapolis, is located along the river. The two forks meet just north of Petersburg and empty into the Wabash River at Mount Carmel, Illinois.

The Embarras River (/ˈɛmbrɑː/ EM-brah) is a 195-mile-long (314 km) tributary of the Wabash River in southeastern Illinois in the United States. The waters of the Embarras reach the Gulf of Mexico via the Wabash, Ohio, and Mississippi rivers. The river drains a watershed around 1,566,450 acres (6,339.2 km) in an agricultural region. It arises near Champaign-Urbana and flows south to near Vincennes, Indiana. The name comes from French explorers, who used the French word, embarras, for river navigation obstacles, blockages, and difficulties relating to logjams.