The present article examines the provisions on the western frontier of Poland in the treaties concluded by the Federal Republic of Germany in 1970 with the Soviet Union and Poland. The emphasis will be on the Polish-German Treaty, which is essentially concerned with the settlement of the frontier issue between the two parties. The article deals with the position of the German party and its competence to enter into treaty obligations that bear on the frontiers of Germany, as well as with the competence of the Great Powers to do so. Further, the article elucidates the meaning and effects of the resolution which the German Bundestag adopted when it voted the laws which approved the treaties and enabled the President of the Federal Republic to ratify them. Against this background of the competences of the interested states, the article briefly analyzes the contents of the clauses that bear on the Oder-Neisse frontier.