A quick Googling reveals that this direction predominates over the other three, though the north forty yields a fair showing

I was appalled not to find the expression in the usual dictionaries; slang, idiom, or otherwise. To my understanding, the term is used to denote any area of vacant land adjacent a home or ranch, regardless of its size and usu its direction from the house

All further input welcome--thanks guys
and gals

huh. up here it's the north forty pretty regular like.

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huh. up here it's the north forty pretty regular like.

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agreed, from even moreso -- indicating a certain pejorativeness, like it's the last plot to be
plowed (spring or winter), and used allusively.

edit: and not just up here..

Willie Nelson's 33rd Annual 4th of July Picnic - Fort Worth ...
... in the early afternoon, joining up with Marty Dread and Los Maui Boys
on the south stage of the North Forty concert venue in the Fort Worth Stockyards.

edit[2]:
Did you ever notice how Timmie would talk to Lassie? "Lassie, Lassie, go get Mom and Dad and tell them I'm down by the beaver pond and I'm stuck under a pine tree. It's a loblolly pine tree, not the long-leaf variety. They are on the north forty, Lassie. Not the south forty, the north forty, on the red tractor." And Lassie would take off. "Woof!" That would be all Lassie would say, "Oh my God, Paul. Timmy is down by the beaver pond stuck under a loblolly pine tree."