questions to atczsk

clearly the tripoint is where the thaya joins the
morava

atcz is thaya 
czsk upper morava
atsk lower morava

but not having seen any of the treaties
i dont know if the boundaries follow the thalwegs 
or the median lines
or some other regime

& the answer to that question would make a difference
in the location of the tripoint
since thalweg junctions tend to produce oblique wye
shapes that meet farther downstream than do midline
junctions 
which are typically reckoned & represented as abrupt
rectilinear tees
even if the confluences are wye shaped

but my guess is 
these rivers are not navigable in this location by
deep draft vessels
& thus that the boundaries follow the median lines in
all 3 cases

& if i am correct about that
then i believe the tripoint is pretty much where
jesper has pinned it
or perhaps very slightly below
as i will try to explain

but if my guess is mistaken & the borders do follow
the thalwegs
then i think the tripoint would fall so far downstream
as to be not only outside the pushpin circle 
but possibly even as far downstream as the yellow line

now 
how to find out which principle of delimitation is the
actual one
& indeed whether the principle is the same for all 3
convergents

for in fact 
other slightly different positions would result if the
principles turned out to be other than these two 
& or turned out to be not the same on all 3 borders

like say what if the morava proved to be navigable
here & the thaya not
or something weird like that

for in fact the 1911 britannica for example says only
the morava is at all navigable
& only for an unspecified stretch

& of course in times of drought the whole question
waxes academic
since thalwegs & medians & everything else in slack
water converge toward perfect agreement anyway


but can anyone settle any of this


in the meantime
no tripoint stretching diagram per se

rather the white line between little red squares on
the attached overzoomed satpic 
tries only to connect the midpoint of the thaya mouth
just where it kisses & joins the morava
at left 
to the corresponding & perpendicular midpoint of the
morava 
at right

& i believe this actually represents a conventional
tripointing stitch that is sometimes performed by
boundary makers & cartographers in such a case of
midline junctioning
if indeed this is such a case

but at any rate
in this case
the righthand red square does represent my best
guessed atczsk

& in acknowledgment & salute to jesper 
well within the pushpin circle when viewed at normal
viewing range


& again
all of this is offered very modestly & sketchily &
with a request for the much needed better data 

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