http://www.urban-age.net/03_conferences/conf_mexicoCity.html
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boundary:
1. Something that indicates a border or limit.
2. The border or limit so indicated.
brink:
1.
a. The upper edge of a steep or vertical slope: the brink of a cliff.
b. The margin of land bordering a body of water.
2. The point at which something is likely to begin; the verge: "Time and again the monarchs and statesmen of Europe approached the brink of conflict" (W. Bruce Lincoln). See Synonyms at border.
to speak of : Worthy of mention: There's nothing new to speak of.
set·tle·ment n.1. The act or process of settling.
2.
a. Establishment, as of a person in a business or of people in a new region.
b. A newly colonized region.
borough - one of the administrative divisions of a large city.
por·tray (pôr-tr, pr-)portrayed
tr.v. por·trayed, por·tray·ing, por·trays
1. To depict or represent pictorially; make a picture of.
swamp: flood - cover with liquid, usually water;
sprawl - an aggregation or continuous network of urban communities
