As I understand it: The border marker 423 is originally Russian-
chinese only, but probably for the convenience of setting up a 
borderline which ends in the middle of the river Tumen, this border 
marker is taken as a starting point (cf. art.1). From this point the 
line is perpendicular to the Chinese-korean borderline formed by the 
middle of the main channel of the river Tumen. The waters of the 
river behind the borderline going from border marker 423 to the 
middle of the river are called "joint boundary water area of China 
and Korea DPR". So the waters are joint, and it makes it easier for 
the Korean border guards to shoot at people fleeing the country as 
long as they are in the river, but once they get on the shore they 
are in China only. The Chinese-korean borderline goes all the way 
through the middle of the river channel up to the point where 
Russia, China and KoreaDPR meet. Further down the stream of Tumen 
river continues Russian-korean borderline being placed again in the 
middle of the course of the Tumen river. We are still talking about 
waters, no land. The tripoints are placed on both sides of the 
river, but they are standing on the sovereign territories, either 
Russia, China or Korea. Art. 4 states that every country is having 
responsibility for one border marker each. The picture of 
bordermarker 3 I've seen here, is Russian responsibility. 
So, reaching a tripoint here means getting wet and go fishing. From 
border marker no.1 on a straight line perpendicular to the middle of 
the stream of the river Tumen, 306,9 m in to the water. Anyone 
should feel pretty safe then :-). Then, still following the line, 
one should get to the shores of the Korea DPR and hit the border 
marker no.2. When still in the water and keeping the line aiming at 
border marker no. 2, to the right you are still in the joint Chinese-
korean joint boundary water area. To the left you are still in the 
water, but whether Russians and Koreans agreed to something similiar 
as the chines and koreans, I don't know.
I'm not clear about why the third border marker has been set up on 
the Russian territory and whether this border marker is placed on 
the same borderline drawn between border marker no. 1 (on Chinese-
russian border) and no. 2 (in Korea). This is why the final protocol 
from 2002 is still needed. 
Petter
--- In 
BoundaryPoint@yahoogroups.com, Michael Kaufman 
<mikekaufman79@y...> wrote:
 > Witness marker 1 (aka CN-RU 423): We know this is
> exactly on the CN-RU boundary and is exactly on the
> point where CN-RU hits the CNKP condo (CN-CNKP-RU). 
> So why is CNKP-KP-RU the official "state boundary
> meeting point of the three countries" (article 1,
> section 2 of the treaty in message 12459)?  Doesn't
> CN-CNKP-RU have just as much the same tripoint status
> since it is one of the 2 terminal points of the
> CNKP-RU triline?
> Also - I am unclear on the condo in this regard:  Is
> the CNKP condo the entire river (1 in diagram) or just
> half of the river on the Chinese side (2 in diagram). 
> I mean we know the triline only goes out to the middle
> of the main channel of the river, but couldn't a
> CNKP-KP line continue after that?  
> -Mike
> 
> > > > ----- Original Message ----- 
> > > From: "Peter Smaardijk" <smaardijk@y...>
> > > To: <BoundaryPoint@yahoogroups.com>
> > > Sent: Thursday, February 05, 2004 11:43 PM
> > > Subject: [BoundaryPoint] Re: cnkpru - more
> > pictures
> > > 
> > > 
> > > > Some more pics (they seem to connect):
> > > > 
> > > > http://members.jcom.home.ne.jp/nagune/p352.jpg
> > > > http://members.jcom.home.ne.jp/nagune/p081.jpg
> > 
> > this latter pic appears to be by far the best pic we
> > have
> > 
> > & if the fence observed by jesper does indeed mark
> > cnru
> > then cnru marker 1 aka 423 should be on the bank at
> > the end of that 
> > fence
> > slightly obscured by the foliage
> > unless that dark dot there near the sand flat is the
> > marker
> > yikes
> > 
> > but in any case the triline should run from this
> > cncnkpru point 423
> > perpendicular to the bank & halfway across the
> > channel 
> > to the unmarked cnkpkpru tripoint at the other end
> > of the triline
> > 
> > does everybody see & get that
> > because i do believe we can visualize all this now
> > for the first time
> > 
> > bravissimos all 
> > in any case
> > > > Peter S.