Which preposition to use with demarkation

between Occurrences 3%

The lines of demarkation between them were gradually drawn, and men began to arrange themselves more and more unequivocally on the opposite sides.

of Occurrences 1%

The Spaniards also expended large sums of money in arming the Creeks, and in bribing them to do, what they were quite willing to do of their own accord,that is, to prevent the demarkation of the boundary line as provided in the New York treaty; a treaty which Carondelet reported to his Court as "insulting and pernicious to Spain, the abrogation of which has lately been brought about by the intrigues with the Indians."

Which preposition to use with  demarkation