South and East of the First Principal Meridian

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South and East of the First Principal Meridian is a land description in the American Midwest.

In 1817, the Ohio-Indiana border was surveyed and became known as the First Principal Meridian for all land surveyed in the rest of the United States. The 41st parallel of north latitude became the base line. Congress Lands lying east of the meridian and south of the base line were first surveyed in 1819 under the direction of Edward Tiffin, Surveyor General of the United States. The tract included Indian reservations surveyed after the tribes left. This survey used the standard six-mile-square township, but townships were numbered north to south. Surveyed ranges were numbered west to east. Before this, land had been surveyed using several inconsistent and less satisfactory systems

Allen, Auglaize, Crawford, Hancock, Van Wert, and Wyandot counties as well as portions of Hardin, Logan, Marion, Mercer, Morrow, and Putnam counties are included in the survey.