Bava Batra 106 - Selling a Field by Landmarks
If the field was found to be of a different size, then if the difference is less than a sixth, the field becomes the buyer's without any adjustment. If the difference is more significant than a sixth, they must adjust, with the seller or the buyer paying the difference.
This 1/6 is different from overcharge since no overcharge law exists for land. Instead, it is an estimate of what people forgive.
Art: Enclosed Field at Eragny by Camille Pissarro
