In which country is the Dreieckiger Pfahl and the former Kingdom of Hanover?
Dreieckiger Pfahl: The Dreieckige Pfahl ("Triangular Post") is an historic boundary stone, about 1.35 metres high and made of granite, located southwest of the Brocken, the highest mountain in the Harz Mountains of central Germany. Dreieckiger Pfahl:  During the division of Germany the border between the German Democratic Republic and the Federal Republic of Germany ran past the "Dreieckiger Pfahl". Kingdom of Hanover:  It succeeded the former Electorate of Brunswick-Lüneburg (known informally as the Electorate of Hanover), and joined with 38 other sovereign states in the German Confederation in June 1815. Kingdom of Hanover:  Briefly revived as the State of Hanover in 1946, the state was subsequently merged with some smaller states to form the current state of Lower Saxony in West Germany, later Germany.
Germany