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ILIllinois Geography
Overview
Illinois occupies the 25th largest area among US states. Located in the Midwest region, specifically the midwest rust subregion, its physical geography reflects its position on the continent. It has coastline on the great_lakes.
Topography and landforms
- Crossed by the Mississippi River
Rivers and water
The mighty Mississippi River borders or flows through Illinois. It is the second longest river in the US (after the Missouri) and was the principal trade route of the early Republic. The state borders one or more of the Great Lakes — Superior, Michigan, Huron, Erie, or Ontario.
Mountains and elevation
Illinois has moderate elevation across most of its territory, without dominating mountain ranges.
Climate and time zone
Illinois falls in the Central time zone. Winters bring heavy snowfall, especially near the Great Lakes or in mountainous areas.
National parks and protected areas
The National Park Service manages many sites in Illinois including national parks, national monuments, national forests, and historic sites. Outdoor recreation is significant — hiking, camping, hunting, fishing, and wildlife viewing.
Wildlife
Illinois's wildlife reflects its geography. Forests, plains, rivers, and (where applicable) coasts support a wide range of mammals, birds, fish, and reptiles. Protected populations of native species are maintained through state and federal wildlife management agencies.
Bordering states
Illinois shares borders with 5 other US states.
Daily geography puzzle
Statedoku uses geographic features (mountains, deserts, rivers, regions) as constraints — practice your map awareness in 5 minutes a day.
Play today's puzzle →Common questions about Illinois geography
What is the climate of Illinois?
Illinois observes Central Time and has a climate shaped by its location in the Midwest region. Specific climate type varies — see the dedicated weather page for details.
How big is Illinois?
Illinois ranks #25 of 50 by area. It is mid-sized by US standards.
Does Illinois have mountains?
No major mountain ranges run through the state.
What national parks are in Illinois?
Illinois has several state parks and may contain national monuments or national forests. Check the National Park Service website for the current list.
Similar states
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