Get offf my laaaaaand!

Q; What do you get if you multiuply one chain by one furlong?

A: an Acre!

Of course you do!

In the medieval mind, it seems that an important measure of area was "how much land could be ploughed by one man using a team of eight oxen in one day" I guess I can see how that would be important, for planning & taxation.

Originally, an acre was understood as a strip of land sized at forty perches (660 ft, or 1 furlong) long and four perches (66 ft) wide;^[4] this may have also been understood as an approximation of the amount of land a yoke of oxen could plough in one day (a furlong being "a furrow long").

I like the idea of a furrow long.