the treaty line
Radcliffe Line
49 Parallel
The Mason - Dixon Line
The boundary line is solid. If not it will be a dashed line.
The African Boundary The southern boundary of the tropics is the Tropic of Capricorn.
The line dividing illuminated areas from night areas is called the terminator.
The boundary line marks the edge or limit of a defined area. The area immediately inside the boundary refers to the space or region that falls within the set limits of the boundary line.
Radcliffe line separates India and Pakistan
The official definition of boundary is "a line that marks the limits of an area; a dividing line."
A boundary is a restriction, a line of demarkation. That fence is the boundary between our property. The ball went outside of the boundary.
The boundary line under the basket is known as the baseline.
If a volleyball hits the boundary line, it is considered in bounds.