the ibs version of the text of the 1942 ecpe treaty
aka the rio protocol gives the following delimitation
of the ecpe terminal sector culminating in the ecpe
convergent to the tripoint
The Lagartococha or Zancudo River, upstream, to its
sources and from there a
straight line meeting the Guepi River and along this
river to its outlet into the
Putumayo, and along the Putamayo upstream to the
boundary of Ecuador and
Colombia.
& this would place the tripoint on the putumayo
somewhere above the guepi confluence
however
the following spanish text does not agree
& places the tripoint directly at the confluence
rather than above it
Desde allí una línea recta que va a encontrar al río
Güepí. Sigue por este río, aguas abajo, hasta su
confluencia con el Putumayo, donde empieza la frontera
con Colombia.
& the terminal ecpe witness monument number 206 is
described in the 1999 ecpe demarcation commission
report as follows
Hito "Boca del Río Güepí", Nº 206, con coordenadas 00º
07 10" S de latitud y 75º 15 27" W de longitud, hito
referencial, en territorio peruano, que corresponde al
thalweg de la boca del río Güepí en su desembocadura
en el río Putumayo punto más septentrional de la
frontera.
& this
even tho it is technically not the northernmost point
on ecpe as is claimed
suggests the tripoint is at the thalweg junction in
the confluence
which happens to be exactly where most maps also show
it to be
for example
http://www.unhcr.org/publ/PUBL/44103bee0.pdf
http://encarta.msn.com/encnet/features/mapcenter/map.aspx?TextLatitude=-0.09331368229258775&TextLongitude=-75.28869561887365&TextAltitude=10&TextSelectedEntity=9404120&SearchEnc=false&MapStyle=Comprehensive&MapSize=Large&MapStyleSelectedIndex=0&searchTextMap=gueppi&MapStylesList=Comprehensive&ZoomOnMapClickCheck=on&ResultsListbox=-0.159457462960985%3B-74.7828054865533%3B7%3B9404120%3BPuerto+Legu%c3%adzamo%2C+Putumayo%2C+Colombia%3BLarge%3BComprehensive
& which pretty well matches the abovementioned
geocoords
however
this map indicates the ecpe convergent & thus the
tripoint position may be in dispute
http://lcweb2.loc.gov/frd/cs/peru/pe00_06a.pdf
so the attached tripoint stretching diagram settles
circumspectly on the thalweg junction but throws in a
bit more than the usual cautions
& the reason i am placing my guessed position so close
to the right bank is that the configuration & momentum
of the putmayo seems to favor the right hand channel
here
& the waters of the comparatively tiny tributary seem
to be immediately overwhelmed by those of the larger
river
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