The area does not appear in Call of Pripyat.
Depending on the revision, however, it can be either collapsed or still intact. The single defining characteristic of the Cordon, present in all revisions, is the railroad bridge in the center of the map, dividing it into two halves. Most rookies stay at the Rookie village north of the actual military cordon outpost until they have enough gear and experience to head deeper into the Zone. Stalkers often refer to the Cordon as the Zone's antechamber. It's the outermost edge of the Zone, guarded by the Military and therefore quieter than most other areas.