Second principal meridian

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U.S. Bureau of Land Management map showing the principal meridians in Illinois, Indiana, and Ohio
Sign along Indiana Route 37, pointing to the marker at the Second Principal Meridian initial point

The second principal meridian coincides with 86° 28′ of longitude west from Greenwich, starts from a point two and one half miles west of the confluence of the Little Blue and Ohio rivers, runs north to the northern boundary of Indiana, and, with the base line in latitude 38° 28′ 20″, governs the surveys in Indiana and part of those in Illinois.

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Coordinates: 38°28′10.02″N 86°27′21.17″W / 38.4694500°N 86.4558806°W / 38.4694500; -86.4558806