A boundaryline is always a thought line, never a real existing one. So if
this line is running across land or water, this doesn't matter. What matters is
how long this thought line is. If it follows e. g. the middle (center) line of a
river, it's bend like the river flows its way down. All this bendings prolong
the boundary line. If, for example, the river dries out or is led into another
direction, the boundary line still will exist according its
original definition there where the center line of the river was.
In case of the Red River boundary betwenn OK and TX there is a thought line
with many bows and curves following the Red River line. Thus, if "pulled" apart,
it will be a longer line than the CANV boundary that runs mostly in two straight
lines.
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