The BYLTPL trifinium is located at the Polish -
Soviet boundary marker No. 1789. This position has for sure another name -
maybe LTPL border marker 0?
left Polish border marker, to right Byelorussian border marker and across the
river the Lithuanian border marker. The position of BYLTPL measured to be 53°
57' 22"N 23° 30' 54,1"E.