the.com/demarcation

means A boundary line marking where one category or territory ends and another begins, especially one drawn to settle a dispute about what belongs inside.

from Traces to Spanish 'demarcación,' built from 'marcar' (to mark), itself rooted in the Germanic word for 'mark' or boundary-stone. It entered English history through the 1493 Line of Demarcation, the pope-drawn meridian splitting the New World's spoils between Spain and Portugal — a reminder that the word was born doing exactly what it still does: carving up a world so someone can claim the bigger half.