Here is what I have received from EE authorities regarding EELV(RU):

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Thank you for your interest in Estonian international borders. Initial
position of Estonian-Latvian border was defined by a protocol issued by
border arbiter British Colonel Tallents in 1920. The borderline was further
refined by conventions, agreements and protocols signed between Estonia and
Latvia in 1920, 1923 and 1927 as well as by resolutions agreed by
Estonian-Latvian Joint Border Commission. The border built in 1922-1927 was
restored in 1992-1999. Adjustments in the actual borderline caused by
changes during the 70-year period were introduced by EstonianLatvian Joint
Border Commission in coordination with local municipalities from both sides.
Rumours that the border splits buildings in the Valga/Valka border town are
a misconception.

The Estonian-Latvian borderline build in 1922-1927 started from the border
mark no. 1 at the Russian-Estonian-Latvian borders' junction point
(tripoint) situated at the west bank of the Kudepi River and ended at the
mark no. 442 at the coast of Livonian Bay.
Estonia restored the border from the mark no. 46+1379 near the tripoint and
situating on the right coast of the Pedetsi River, to the mark no. 219 near
the Valga river. From the mark no. 219 to no. 442 (Ainazi/Heinaste) the
border was restored by Latvia.

Position of the tripoint depends also from Russian Federation. There exist a
preliminary agreement about the triple point, but we cannot publish the maps
about the tripoint as well as border lines around that before this agreement
is accepted by the governments of Estonia and Russia.

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But where is Kudedi river?
On the attached map the EELV border river is called something else
(Laykchne?)

If the border was marked in the 20'es. Can these markers still be found. Or
did the Soviets really remove them?

Jesper