The political map aims to show the limits between regions, but limits created by human beings, who are able to show the political and governmental borders between continents, countries, states and cities. Thus, to know how many cities there are on the California coast, it will be necessary to observe the number of borders that exist in that region, between one city and others, using a political map.
It really depends on the article but in a summary it’s important to include the main points that the author is trying to get across, so anything that the author might be mentioning more than once or just details that you think are important.
