ARTICLE 28.—The boundaries of East Prussia, with the reservations made in Section IX. (East Prussia) of Part III. will be determined as follows:
From a point on the coast of the Baltic Sea about 1½ kilometers north of Pröbbernau Church in a direction of about 159 degrees east from true north: A line to be fixed on the ground for about 2 kilometers, thence in a straight line to the light at the bend of the Elbinger Channel in approximately latitude 54.19½ north, longitude 19.26 east of Greenwich;
Thence to the easternmost mouth of the Nogat River at a bearing of approximately 209 degrees east from true north; hence up the course of the Nogat River to the point where the latter leaves the Vistula, (Weichsel;)
Thence up the principal channel of navigation of the Vistula, then the southern boundary of the Kreis of Marienwerder, then that of the Kreis of Rosenberg, eastward to the point where it meets the old boundary of East Prussia;
Thence the old boundary between East and West Prussia, then the boundary between the Kreise of Osterode and Neidenburg, then the course of the River Skoppau down stream, then the course of the Neide up stream to a point situated about 5 kilometers west of Bialutten, being the nearest point to the old frontier of Russia, thence in an easterly direction to a point immediately south of the intersection of the road Neidenburg-Mlava with the old frontier of Russia;
A line to be fixed on the ground passing north of Bialutten;
Thence the old frontier of Russia to a point east of Schmalleningken, then the principal channel of navigation of the Niemen (Memel) down stream, then the Skierwieth arm of the delta to the Kurisches Haff;
Thence a straight line to the point where the eastern shore of the Kurische Nehrung meets the administrative boundary about 4 kilometers southwest of Nidden;
Thence this administrative boundary to the western shore of the Kurische Nehrung.
ARTICLE 29.—The boundaries as described above are drawn in red on a one-in-a-million map which is annexed to the present treaty. (Map No. 1.)