Principal Meridians and Baselines in Illinois
Description of Map
- The 2nd Principal Meridian runs north-south through Indiana.
- The 3rd Principal Meridian runs north-south through Illinois
along the western edge of Jefferson County (southern Illinois).
- The Baseline used with the 2nd and 3rd Meridians runs east-west
along the northern edge of Jefferson County, Illinois.
- The 4th Principal Meridian runs north-south through Illinois
along the eastern edge of Schuyler, McDonough, Warren and Mercer Counties, Illinois.
- The Baseline used with the 4th Meridian runs through Schuyler, Brown and Adams Counties,beginning at the intersection of the 4th Meridian with the Illinois River in Schuyler County.
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