What is "demarking"

Usage examples of "demarking".

Czerny and the rest of the board, inches away from the line demarking the limits of the prison and the beginning of the world, a dirt path leading downward among boulders to the river flashing along its course.

The towheaded man nudged me forward to stand by Czerny and the rest of the board, inches away from the line demarking the limits of the prison and the beginning of the world, a dirt path leading downward among boulders to the river flashing along its course.