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What is an arpent?

I came across the word "arpent" in an old deed at the Ralls County, Mo., Courthouse. The reference was in this context: "800 arpents on Spencer Creek."

Wikipedia defines arpent as "a unit of length and a unit of area. It is a pre-metric French unit based on the Roman actus." offers a means to convert arpents into more commonly defined acres.

1 arpent equals 0.8448 acre

800 arpents would be 675.8 acres.


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