Where did the Illinois River originate from?

The Illinois River originates at the confluence of the Kankakee and DesPlaines Rivers.

https://en.wikipedia.org/wiki/Illinois_River

The Illinois River originates in northern Wisconsin. To find this information, you can follow these steps:

1. Open a web browser.
2. Go to a search engine like Google or Bing.
3. Type in "Illinois River origin."
4. Look for reliable sources such as government websites, educational institutions, or reputable news outlets.
5. Click on a source that provides information about the origin of the Illinois River.
6. Read the article or webpage to find the specific location or details about where the river originates.

In this case, you would find that the Illinois River starts in northern Wisconsin near the city of Antigo.