A line separating two regions. In specific cases, the word boundary is sometimes omitted, as in State line; and sometimes the word line is omitted, as in International boundary, county boundary, etc. The term boundary line is usually applied to boundaries between politically defined territories, as State boundary line, between two states. A boundary line between privately owned parcels of land is preferably called a property line, or, if a line of the U. S. public land surveys, is given the particular designation of that survey system, as section line, township line, etc. In geodesy, the term is used as equivalent to boundary.