Hallo everybody and Happy New Year!

Now to the point. I happened to come across an old road map which
covers Germany as it looked liked in 1927. Then, the tripoint
between Germany, Austria and Switzerland have been an intersection
of three lines being placed right at the mouth of Rhein river to the
Bodensee. The borderline between Germany and Austria in Bodensee
have been created by a straight line between the point where the
German-Austrian border leaves land and the point where it meets
Austrian-Swiss border following the Rhein river. Also, the border
between Switzerland and Austria shows that it was not the thalweg,
midstream or whatever in the water of Rhein river, but that the
entire Rhein river including all river islands were part of
Switzerland. Austria began on the right shore of Rhein river. So the
tripoint between these countries have been the tip of the right bank
of Rhein river. This means a point which is in fact half wet-half
dry.
It has certainly been topic here before. I just wondered when did
the countries left this (today a ghost) tripoint?

Petter