To demarcate is to set or draw a boundary, like that of a country. It can also mean to separate clearly in other ways.

When you demarcate, you’re creating a boundary. Election officials who create or change boundaries between districts are demarcating. Demarcating usually starts with making lines on a map, but those lines have power in the world, as they change the size of a district, state, country, or other place. The word can be used more broadly for creating other types of separation. At work, a boss could demarcate which employees are responsible for which work, which is another kind of separation.

Definitions of demarcate
  1. verb
    set, mark, or draw the boundaries of something
    synonyms: delimit, delimitate
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    type of:
    circumscribe, confine, limit
    restrict or confine, "I limit you to two visits to the pub a day"
  2. verb
    separate clearly, as if by boundaries
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