Iowa Constitution
Boundaries.

Beginning in the middle of the main channel of the Mississippi River, at a point due east of the middle of the mouth of the main channel of the Des Moines River, thence up the middle of the main channel of the said Des Moines River, to a point on said river where the northern boundary line of the state of Missouri — as established by the Constitution of that state — adopted June 12th, 1820 — crosses the said middle of the main channel of the said Des Moines River; thence westwardly along the said northern boundary line of the state of Missouri, as established at the time aforesaid, until an extension of said line intersects the middle of the main channel of the Missouri River; thence up the middle of the main channel of the said Missouri River to a point opposite the middle of the main channel of the Big Sioux River, according to Nicollett’s Map;* thence up the main channel of the said Big Sioux River, according to the said map, until it is intersected by the parallel of forty three degrees and thirty minutes north latitude; thence east along said parallel of forty three degrees and thirty minutes until said parallel intersects the middle of the main channel of the Mississippi River; thence down the middle of the main channel of said Mississippi River to the place of beginning.

*In the original text, a colon was used, see original Constitution preamble See boundary compromise agreements at the end of the last volume of the Code