Northern Indiana's physical geography was significantly shaped during Wisconsin glaciation, resulting in a till plain ranging from flat to gently rolling terrain, especially in the Wabash Valley.
The region experiences a humid continental climate, supporting temperate deciduous forest, tallgrass prairie, and wetland ecosystems.
Manufacturing remains a vital part of the region's economy, particularly in the production of recreational vehicles, medical devices, and steel.
[1] Northern Indiana is home to about 25 public and private higher education institutions, including more than a dozen religiously affiliated colleges and universities.
Cass and Miami counties have economic ties to the Kokomo metropolitan area, also typically considered part of Central Indiana.
The major cities of Northern Indiana are Fort Wayne (in the northeast), South Bend (in the north-central region), and Hammond and Gary (in the extreme northwest along Lake Michigan).
Outside the metropolitan areas, the region's agricultural sector is abundant provided its location within the fertile Corn Belt.
Northern Indiana is also situated in the heart of the Rust Belt, an area of the U.S. that has suffered deindustrialization and some economic stagnation since the late 20th century.
General Motors' Fort Wayne Assembly near Roanoke produces the Chevrolet Silverado and GMC Sierra.
South Bend-based AM General manufactures the civilian Hummer H1 and military Humvee at its Mishawaka assembly plant.
Natural gas is primarily supplied by the Northern Indiana Public Service Company (NIPSCO), a subsidiary of Merrillville-based NiSource.
Northern Indiana's share of renewable energy generation, particularly solar and wind sources, has increased since the late 2000s.
Upon its completion, the Mammoth Solar project will be the largest in the U.S., covering 13,000 acres across rural Starke and Pulaski counties.
[28] Two regional transmission organizations serving the nation's electrical grid provide coverage to portions of Northern Indiana: Midcontinent Independent System Operator and PJM Interconnection.