http://groups.yahoo.com/group/BoundaryPoint/message/10911
Due to the changing course of the river, the
bordermarker on the bridge is now directly over land
on the northern/US bank of the Rio Grande. The bridge
itself and its supports are Mexican all the way up
until the marker. But for everything else, the border
is the middle of the river. So for instance, you
could be standing on the bridge say 2 feet south of
the bordermarker. Directly beneath you is a sovereign
Mexican bridge. But beneath and above that is
soverign US airspace and land on the north bank of the
Rio grande. You are in the US even though you are
south of the marker. Only the physical bridge is in
Mexico. But you can not be in Mexico this way since
you would have to occupy the same physical space as
the bridge at the same time, which is, of course,
impossible. If you were on the bridge and wanted to
visit Mexico, you would have to walk further south
until you pass the middle of the river. This is how I
understand the situation to be.
-Mike

--- Jesper Nielsen <jesniel@...> wrote:

>
> > Not hard! As we now know from the US-Mexico
> border bridges and from
> > the former situation at Steinstuecken, boundaries
> don't have to extend
> > very far into the ground and need not include
> much, if any, airspace.
>
> Examples from MXUS?
>
> Jesper
>

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